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Naudy Automatic Model interpretation (T43)

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1. You can specify the search complexity and whether to always refine the data INTREPID will always use these settings when it calculates the model i e when you Choose Create the Model in the Model Parameters and Testing dialog box Display a line for which no model exists Process your selection of lines formally using the Process button gt gt To specify the complexity and extent of the calculation and refinement process 1 Choose Advanced Options from the Interpret menu INTREPID displays the Advanced Options dialog box which contains the search complexity and refinement options a Advanced Model Options Width of Naudy operator 1 50 x Depth l Remove clearance from body depths Average Survey Clearance 59 05 M Dump all similarity data for current line M Allow Negative Susceptibility Automatically Invert when Calculating Model Depth Bias Increase successive depths by a factor of 1 20 C Finer Sampling with Depth Shallower Solutions Body Type Dykes C Steps allow prism formation Intra sediments C Dykes some Steps C Steps some Dykes M Use range of widths for Dykes Intrased Dip Search Strategy Always vertical Use Naudy Derived Dips C Best of 45 90 135 Dip Accept Strategy Accept everything ignore bad naudy dips C Reject Bad Naudy Derived Dips gt 45deg from vertical dip C Adjust Poor Naudy Derived Dips Error gt 30 Body Strike Options Set Bodies Perp
2. Help Top 2012 Intrepid Geophysics 4 Back gt INTREPID User Manual Naudy Automatic Model interpretation T43 16 Library Help Top lt 4 Back gt The Naudy Automatic Model main window Library Help Top The following diagram summarises the components of the Naudy Automatic Model main window Naudy Automatic Model main window E Intrepid Automatic Modelling eez File Edit View Interpret Help Line 14100 Signal Field microlevelled Bearing 271 T T T Line profile display area The vertical azis indicates magnetic intensity nT 7 Input Z field profile black T Calculated Z field from Naudy model red Scan button calculate the model for the current diplayed line 50 2000 4000 6000 8000 10000 Next Previous Go to buttons t display the Z field profile and the model for the Invert button refines the model of EZE Process _ coo f Next gt gt _ nex previous selected line the current displayed line Naudy solutions p 1 i py Process button prompts you to a select lines then processes them with the current setting 1000 t Solution quality j L A goodit Naudy model display colour legend Colours X lt 2 indicatethe similarity coefficient Naudy model display area shows ead iy 4 y Naudy solutions or inferred a geological structures The vertical CLICK TOP OF BODY RIGHT FOR INFORMATION LEFT TO EDIT CTRL LEFT TO DELER
3. axis indicates depth m Done 22 bodies Upper plot The black line shows the measured two dimensional magnetic profile for the given traverse line The red line shows the predicted magnetic profile that would result from the Naudy derived solution the magnetic bodies shown in the lower plot that is the optimal number position dip angle and depth of magnetic bodies pre described either as dyke shapes or step shapes Lower plot The lower plot contains the Naudy solutions It illustrates the optimal number position dip angle and depth of magnetic bodies required to give the best possible match of measured to predicted magnetic intensity signal for the given traverse line The bottom right hand legend indicates goodness of fit solution quality for each individual body by means of colour coding You can easily see a measure of overall solution quality for the traverse line by comparing the black and red profiles in the upper plot Horizontal axis The horizontal axis on both the upper and lower plots represents the distance in metres from the start of the traverse line 2012 Intrepid Geophysics 4 Back gt INTREPID User Manual Naudy Automatic Model interpretation T43 17 Library Help Top lt 4 Back gt Vertical axis in the upper plot The vertical axis in the upper plot represents the magnetisation in nT Notice that the data is de trended as it is re
4. processing it as described in this section gt gt To query the current line and select options Line 100910 Signal Field FINALMAG Bearing 89 Line Statistics No of Samples 356 No of Interpolated Samples 356 Field Minimum Maximum Mean StdDev Nulls 9 879406982196 15 835268618954 2 318249645326 5 322941 0 Nyquist Frequency 71 0595 cycles km Sample Spacing C Use Fixed Spacing 0 00703636157 km Use Average Spacing 0 00703636157 km Minimum Sample Spacing 0 00684375 km Maximum Sample Spacing 0 00711134931 km Interpolation Method Linear C Cubic Spline C Nearest Neighbour Detrend Method C DC shift Use line ends C Least square fit 10 Number of points to take into account at line ends for line end detrending Q OK Cancel Average Line Direction North to top Display Options V Detrend Raw and Filtered Line M Overlay Filtered line Zoom Both Lines 1 Right button click the line display INTREPID displays the Current Line Statistics and Options dialog box 2 View the statistics and select options as required then choose Accept No of Samples The number of data points in the current line that have values for the current observed field No of Interpolated Samples The number of data points in the current line derived by resampling and used for the Naudy Automatic Model calculations Max Signal Value Min Signal Value Mean Signal Value Sign
5. Top Naudy Automatic Model interpretation T43 44 lt 4 Back gt created automatically during this process We have annotated the report as an aid to helping you to interpret the process Actual Number of Simple Bodies used for worms 329 ORIGINAL Naudy solution count Initial Worm count 105 First go at forming WORMS 3D Body Data from naudyd to File OriginalWorms csv Original Worm count 105 Export to Geomodeller Worms 0 Total simple bodies used 0 Conditioned sorted worm step 17 duplicate bodies 1 out of order 0 strike issues 0 dip issues 3D Body Data from naudyd to File joiningWormsl csv Original Worm count 91 Export to Geomodeller Worms 28 Total simple bodies used 105 Conditioned sorted worm step 25 duplicate bodies 0 out of order 0 strike issues 0 dip issues 3D Body Data from naudyd to File joiningWorms2 csv Original Worm count 87 Export to Geomodeller Worms 25 Total simple bodies used 85 Conditioned sorted worm step 7 duplicate bodies 1 out of order 0 strike issues 0 dip issues 3D Body Data from naudyd to File joiningWorms3 csv Original Worm count 84 Export to Geomodeller Worms 25 Total simple bodies used 95 Conditioned sorted worm step 7 duplicate bodies 0 out of order 0 strike issues 0 dip issues 3D Body Data from naudyd to File joiningWorms4 csv Original Worm count 82 Export to Geomodeller Worms 26 Total simple bodies used 101 Conditioned sorted worm step 12 duplicate bodies 0 out o
6. no longer in use Dip not in use no longer in use Kb not in use RMS_ERROR Library Help Top 2012 Intrepid Geophysics The misfit of the calculated body to the observed signal as estimated during an inversion stage is now also reported 4 Back gt INTREPID User Manual Naudy Automatic Model interpretation T43 50 Library Help Top 4 Back gt Displaying options and using task specification files Displaying options See Querying lines and setting resampling options for information about displaying the pre model settings for the current line See Specifying the modelling process for information about displaying the model calculation and refinement specifications Using task specification files Library Help Top You can store sets of file specifications and parameter settings for Naudy Automatic Model in task specification job OLD or task NEW files gt gt To create a task specification file with the Naudy Automatic Model tool 1 Specify all files and parameters 2 If possible execute the task choose Apply to ensure that it will work 3 Choose Save Options from the File menu Specify a task specification file INTREPID will add the extension job INTREPID will create the file with the settings current at the time of the Save Options operation For full instructions on creating and editing task specification files see INTREPID task specification job files
7. then display them and the refined calculated field Intrepid Automatic Modelling Tool 3 2 Line i 30180 Z Dataret MAG Beating 270 Up to ____ inversion iterations This parameter specifies the maximum number of refinement iterations INTREPID will perform in a refinement operation If this parameter is too low you may not obtain the optimum fit for the calculated field If the parameter is too high the process may take additional time without benefit Library Help Top 2012 Intrepid Geophysics 4 Back gt INTREPID User Manual Library Help Top Specifying body strike for the Naudy model point dataset Library Help Top Naudy Automatic Model interpretation T43 39 4 Back gt When you create the model you can specify a constant body strike for all inferred geological structures See Specifying constant body strike in Scanning for Naudy solutions for details INTREPID can include individual body strike data for each inferred geological structure You can obtain body strike information by turning on the Calculate Trends option in the Advanced Model Options dialog If you specify Calculate Trends INTREPID will adjust the values in the Strike field of the Naudy model point dataset to incorporate this data Choose Model Parameters from the Interpret menu INTREPID displays the Advanced Model Options dialog box Advanced Medel Options Width of Naudy o
8. 0 06061 1 3 531064 73 7410781 03 530993 60 7410898 54 Dyke9g 4 125 57 141 1 51 16 15 0 1 1 0 00196 1 2 531615 26 7411761 93 531501 02 7411844 68 Dyke10 8 124 81 342 5 77 03 7 9 20 8 0 04587 1 3 530960 20 7410889 42 530678 48 7411084 26 Dyke11 4 134 65 151 5 57 80 0 2 10 9 0 02639 1 6 530906 49 7410902 06 530797 97 7411007 73 Dyke12 5 105 61 149 0 38 92 9 2 10 2 0 00738 1 6 531125 42 7411243 33 530981 47 7411281 96 Dykel13 6 136 82 470 2 53 92 6 9 5 4 0 03324 1 1 530873 38 7410934 86 530547 15 7411273 42 Dykel4 5 102 72 467 0 55 26 6 7 1 6 0 00434 1 6 531336 44 7411548 72 530879 80 7411646 58 Dykel15 8 146 70 432 1 43 47 15 7 6 3 0 01271 1 0 530896 43 7411288 80 530658 46 7411649 51 Dykel6 8 142 80 299 7 47 83 10 2 8 0 0 00901 1 2 530544 52 7410983 14 530362 99 7411221 66 Dykel17 4 119 77 147 9 34 51 8 1 2 9 0 00512 0 9 530764 82 7411453 30 530635 65 7411525 41 Dykel18 5 131 64 197 6 44 76 3 1 4 7 0 01340 0 9 530503 68 7411334 13 530355 70 7411465 11 Dykel9 7 121 53 276 5 42 10 7 4 0 9 0 00208 1 7 530976 94 7412246 62 530740 30 7412389 68 Dyke20 4 35 64 266 2 57 78 2 7 2 7 0 00391 1 5 530341 70 7411441 79 530496 82 7411658 16 Dyke21 7 118 78 279 6 76 74 10 3 5 2 0 02023 1 2 530355 06 7411526 37 530108 75 7411658 71 Dyke22 5 138 66 195 9 41 38 6 9 1 2 0 00
9. 41036 9029453278 InducingFieldAzimuth 0 64450229434569 InducingFieldInclination 28 277338372818 AutoIGRF 1 StartDepth 50 0 EndDepth 30000 0 DepthIncrement 1 1 AmplitudeCutoff 2 0 BodyStrike 0 0 AutoStrike 1 BinSizexX 0 5 BinSizeZ 0 5 LineSpacing 200 0 TrendCellSize 70 0 Complexity 0 AutoStrikeOut 1 MaxInvertIterations 10 Threshold 3 0 BodyCode BT_DYKE NaudyOptions End Library Help Top 2012 Intrepid Geophysics lt 4 Back gt INTREPID User Manual Naudy Automatic Model interpretation T43 53 Library Help Top lt 4 Back gt WormOptions Start Geomodeller_minimum_number_hot_spots 4 CreateDykeLinears 1 RequiredMagnetization_Worms MAG_ALL MakeFiniteDykes 1 CullReversePolarity 1 BestFitting 1 BestFittingPercent 50 WormOptions End ProcessParameters Begin Process ALL_LINES StartLineNumber 0 EndLineNumber 0 NoOfLines 0 SampleMode XY_BASED ProcessParameters End Parameters End Process End Here is a more fully annotated version more annotated job file showing all options with most of the enumerates Process Begin Name naudyd OutputNaudyModel data naul DIR OutputWorms data worml DIR OutputTrends data trend1 DIR InputLines raw TeisaDsubset1 DIR InputZ raw TeisaDsubset1 DIR MagFinal InputModel data naul DIR can update an existing model InputTrends data trend1 DIR can use existing trends database Parameters Be
10. Accept before INTREPID will use your settings rc Advanced Model Options Width of Naudy operator 1 50 x Depth l Remove clearance from body depths Average Survey Clearance 59 05 M Dump all similarity data for current line M Allow Negative Susceptibility M Automatically Invert when Calculating Model Depth Bias Increase successive depths by a factor of 1 20 Finer Sampling with Depth Shallower Solutions Body Type Dykes C Steps allow prism formation C Intra sediments C Dykes some Steps C Steps some Dykes Use range of widths for Dykes Intrased Dip Search Strategy Always vertical C Use Naudy Derived Dips C Best of 45 90 135 Dip Accept Strategy Accept everything ignore bad naudy dips Reject Bad Naudy Derived Dips gt 45deg_ from vertical dip Adjust Poor Naudy Derived Dips Error gt 30 Body Strike Options Set Bodies Perpendicular to Line C Use a Fixed Body Strike of 0 00 degrees 0 means true north Calculate Trends requires even spaced parallel acq lines Edit Trend filters OK Cancel 2012 Intrepid Geophysics 4 Back gt INTREPID User Manual Naudy Automatic Model interpretation T43 33 Library Help Top Library Help Top lt 4 Back gt Naudy solutions display The following illustration shows a line s Naudy solutions displayed as small squares after scanning and resampling The horizontal
11. Library Help Top lt 4 Back gt 7 Ifyou will be calculating further Naudy solutions return the Finishing at Depth in the Automatic Modelling Options and Testing dialog box to an appropriate value for this process The Plan View window shows lines for which the current model exists The inferred geological structures are coloured rectangles superimposed on the lines Plan view Depth Similarity Or oo HoH F me tino Change mode Close t tiit t Ji RE Change mode i Close The rectangle dimension perpendicular to the lines simply indicates the line spacing allowing you to identify the line from which the solution originates The rectangle dimension parallel to the lines indicates the widths of the inferred geological structures and corresponds to the width as displayed in the profiles in the Naudy Automatic Model main window The colour of the rectangle either corresponds to the depth of the inferred geological structure or the similarity coefficient The colour legend in the lower right corner has a label indicating the current display mode The range of depth values in the legend Depth colour mode The maximum value corresponds to the current Finishing at Depth setting in the Scan section of the Automatic Modelling Options and Testing dialog box It does not necessarily correspond to the value of this parameter at the time the model was calculated See Scanning
12. a later time 2012 Intrepid Geophysics 4 Back gt Library Help Top INTREPID User Manual Library Help Top Naudy Automatic Model interpretation T43 12 lt 4 Back gt Choose the options as required from the File or Interpret menu The illustrations below show the file menu before and after loading a line dataset Edit View Interpret _ Help Load Line dataset Load Existing Model Save Model As Save Trend Point Data Save Worm Line Data Specify report Export Dykes to Geomodeller Export Model to MAPCOMP Export Model to jMapprint Load Options Save Options Quit a Intrepid Automatic Modelling File Edit View Help Earth s Magnetic Field Model Parameters Sensitivity Test Parameters Always Regenerate Model Start Potent4 modelling sessior In each case INTREPID displays an Open or Save As dialog box Use the directory and file selector to locate or specify the file you require See Specifying input and output files in Introduction to INTREPID R02 for information about specifying files INTREPID may need to obtain information from the dataset aliases If you select geographic or chronological resampling See Resampling mode for data preparation the dataset must have aliases identifying appropriate field names Alias For geographic resampling Field X Y X coordinate geographic location Y coordinate geographi
13. a task specification job file that you have previously prepared See Displaying options and using task specification files for details Specifying input and output files To use Naudy Automatic Model File gt Load Line Dataset You will need to specify the line dataset to be loaded and the database field to be processed File gt Save Model As When you have finished your modelling session you must specify a Naudy model point dataset for saving the calculation results File gt Save Trend Point Data You can also save trend point data calculated during a modelling session to an Intrepid or Geosoft database File gt Save Worm Line Data Worm line data generated from the above trend calculations can also be saved This is not to be confused with the next recetly released feature File gt Export Dykes to Geomodeller The full model solution set is resorted and searched to form 3D dykes that link the individual HOT SPOT solutions that are spatially coherent Susceptibilities RMS error estimates thickness dip and strike are part of the solution set A set of linear summary dykes is laso available as a seperate CSV file File gt Specify Report Before proceeding with a modelling session it is recommended that the user specify a report file name for saving the progressive results of a session Naudy uses a default file name and this will is appended to from session to session making it difficult to track results and settings at
14. and selecting the best solution in each solution region Naudy threshold greater than Similarity coefficient threshold INTREPID will reject Naudy solutions with similarity coefficients above the level that you specify here TMI anomaly less than Intensity threshold Use this to specify the minimum amplitude in nT of anomalies to include in the calculation Thin solutions using depth factors of Depth distance factors Advanced option INTREPID examines a region surrounding each solution If the region contains one or more other solutions INTREPID retains the solution with the lowest similarity coefficient and rejects the others The Naudy operator width and Depth distance factors determine the size of the region examined around each solution This thinning option is no longer available to the user The thinning operation is now applied automatically using sensible defaults of 0 5 and 0 5 half the depth sample interval and half the body separation 2012 Intrepid Geophysics lt 4 Back gt INTREPID User Manual Naudy Automatic Model interpretation T43 36 Library Help Top lt 4 Back gt Creating the model inferred structures and initial calculated field Library Help Top After you have calculated and resampled the Naudy solutions INTREPID can calculate the model and display the corresponding inferred geological structures It will also display the calculated field for the structures as a red curve superim
15. clearance from estimated depths etc The next step is to calculate and refine the model for some or all lines from the dataset See Calculating the model for all or part of the dataset for instructions Remanence Remanence is also a big subject so for TMI a negative susceptibility is a poor man s method of indicating dykes that could have reversed vector components to the IGRF The big interest however comes with FTGM or magnetic tensor gradients Suddenly it is no longer possible to fit a simple DYKE to every anomaly if in fact the anomaly is caused by something that is not inherently 2D in nature With TMI you can always find a 2D solution to every anomaly Further once there is a 2D body the tensor gradient components very clearly also carry a great deal of rotational information about the induced magnetic response vector so a new algorithm is delivered here Library Help Top 2012 Intrepid Geophysics 4 Back gt INTREPID User Manual Naudy Automatic Model interpretation T43 28 Library Help Top Library Help Top 4 Back gt that at step 2 searches for a magnetic vector s 2 primary orientation measures inclination and declination that best explains the tensor gradient component distribution Following this a bounded non linear inversion of the geometry factors and the susceptibility is undertaken to improve the estimation of the DYKE HOT SPOT to best fit the observed field This is an
16. gt Advanced Options dialog box INTREPID will automatically refine models as part of the creation process The Automatically Invert option is equivalent to Refine the Model in the Automatic Modelling Options and Testing dialog box In this case you will not normally need to perform the steps described below If you do choose Refine the Model with Automatically turned on INTREPID will perform another set of refinement iterations INTREPID will automatically cease iterations if it is failing to improve the fit of the calculated field See Search complexity and refinement options for details about the Automatically Invert check boxes 2012 Intrepid Geophysics 4 Back gt INTREPID User Manual Naudy Automatic Model interpretation T43 38 Library Help Top lt 4 Back gt Refining the model gt gt To refine the inferred geological structures and optimise the calculated field for the current line The following steps assume that you have displayed the Model Parameters and Testing dialog box scanned for Naudy solutions and resampled them then created the model displaying the inferred geological structures and that the Automatically Invert option is turned off in the Advanced Options dialog box 1 Specify the number of inversion iterations Opt Refine the Model tor up to 5 Inversion Iterations 2 Choose Refine the Model INTREPID will refine the inferred geological structures for the current line
17. instructions Interpret gt Sensitivity Test Parameters Display the Model Parameters and Testing Options dialog box Specify the parameters A Scan for solutions B Resample the Naudy solutions C Create the Model and finally Opt Refine the Model using Inversion Repeat the search and resample with different parameters as required See Finding and resampling Naudy solutions for instructions INTREPID displays graphically the similarity coefficients and position of Naudy solutions Specify the line spacing of the input dataset and create the Naudy model for the current line calculating shape size and position of inferred geological structures and the initial calculated field See Creating the model inferred structures and initial calculated field for instructions INTREPID displays the inferred geological structures If required specify the number of inversion iterations then refine the inferred geological structures and optimise the fit of the calculated field with the observed field See Refining inferred structures and optimising the calculated field for instructions Repeat steps 7 10 as required until you are satisfied with the results Interpret gt Model Parameters For regularly spaced line data specify Body Strike Options Calculate trends to provide estimated body strike information for the inferred structures See Specifying body strike for the Naudy model point dataset for instructions Apply the process to some
18. lt 4 Back gt Field new Field old Description LineNPoints new Number of interpolated points in line from which INTREPID derived the inferred geological structure LineX0 new Coordinates of first point in line from which INTREPID derived the inferred geological structure Liney0O new Haz RemAz Declination of inferred geological structure s remanent magnetic field All inferred geological structures currently have 0 remanent fields H RemH Intensity of inferred geological structure s remanent magnetic field All inferred geological structures currently have 0 remanent fields Hinc RemInc Inclination of inferred geological structure s remanent magnetic field All inferred geological structures currently have 0 remanent fields MC_Length MC_Length Scaled version of field Length for use in hard copy composition being phased out MC_ Slope MC_Slope Scaled version of field Dip for use in hard copy composition being phased out MC Width MC_Width Scaled version of field Width for use in hard copy composition being phased out no longer in use Plunge Plunge of inferred geological structure rotation about axis in the line direction All inferred geological structures currently have Plunge 0 no longer in use Isotropy Isotropy 1 if the magnetic susceptibility of the inferred geological structure is direction independent all INTREPID solutions data currently has this value no longer in use Density not in use
19. or all of the dataset lines using Process from the Naudy Automatic Model window See Calculating the model for all or part of the dataset for instructions If you wish to record the specifications for this process in a job file in order to repeat a similar task later or for some other reason use Save Options from the file menu See Displaying options and using task specification files for detailed instructions 2012 Intrepid Geophysics 4 Back gt Library Help Top INTREPID User Manual Naudy Automatic Model interpretation T43 11 Library Help Top 15 16 17 18 4 Back gt File gt Save Model As Once you have completed your modelling run you must specify a new output Naudy model point dataset to save your results using Save Model As from the File menu If you wish to adjust the process and apply it again repeat steps 6 12 using the same dataset and TMI field Edit gt Clear Model for All Lines Alternatively you can clear the model for the the current line and continue or clear the model for all lines and start again with a new set of parameters before saving your model results File gt Quit To exit from Naudy Automatic Model choose Quit from the File menu If you have not saved your model results you will be prompted with a summary of the number of results saved and be given the opportunity to Cancel Save the results and then Quit You can execute Naudy Automatic Model as a batch task using
20. position of the squares indicates their geographic position corresponding to the line above Their vertical position indicates the depth of the Naudy solutions according to the scale on the vertical axis The size of the squares indicates their similarity coefficient A large square indicates a low similarity coefficient E Intrepid Automatic Modelling Lo les File Edit ie nterp Interpret Help Hne 100910 Signal Field FINALMAG Bearing LES T Invert Process fj lt lt Previous E Coto Next gt gt Naudy solutions Scan ES _ 400 olution quali I Sol i i lt 2 s00 Done Fitting RMS body 9 07 4 bodies Scanning for Naudy solutions The following steps assume that you have Selected and displayed the line for scanning and Ignore any inferred geological structures that INTREPID displays for the line before you commence This process will overwrite them gt gt To scan for Naudy solutions 1 Select the Interpret gt Model Parameters and specify width of Naudy operator depth increment finer sampling with depth remove clearance body type Dykes Steps Intrasediments Dip search strategy and body strike options calculate trends for regularly spaced lines in the Advanced Model Options dialog 2 Select Interpret gt Sensitivity Test Parameters and specify the Start and Finish depth and the maximum allowed Absolute Susceptibility in the Model Parameters a
21. profile according to the height of the zoom area you specified and the profiles included in the selection Set the vertical scale of the inferred geological structures to match their horizontal scale and maintain the original aspect ratio Library Help Top 2012 Intrepid Geophysics 4 Back gt INTREPID User Manual Naudy Automatic Model interpretation T43 20 Library Help Top lt 4 Back gt gt gt To zoom in on an area of the display 1 Move the mouse pointer to one corner of the region that you wish to enlarge Hold down the left button and drag to the diagonally opposite corner of the region INTREPID displays a light blue frame defining the region you select 2 Release the mouse button INTREPID will enlarge the display to show only those points you selected Intrepid Automatic Modelling Tool V3 2 File Options Interpret Line 2942 Z Hotoretmievel mag Bearing 271 T T T T T T T yo ye ae e p Ho ae z 200 Haso Solution quality s00 loo 3 s0 4 4 gt 4 ibad gt gt To zoom out Double click anywhere in the zoomed display left mouse button Library Help Top 2012 Intrepid Geophysics lt 4 Back gt INTREPID User Manual Naudy Automatic Model interpretation T43 21 Library Help Top lt 4 Back gt Querying lines and setting resampling options You can display information about the current line and select a range of options for
22. 224 1 6 530337 95 7411746 20 530208 14 7411892 98 Dyke23 4 86 82 240 2 91 81 8 1 55 7 0 04371 1 3 530129 97 7411665 63 529890 10 7411652 58 Dyke24 4 122 73 144 9 36 63 3 6 7 0 0 01802 1 9 529884 56 7411240 96 529761 77 7411317 82 Dyke25 7 133 70 313 8 29 86 6 5 1 8 0 00385 1 0 530255 08 7411953 91 530027 85 7412170 29 Dyke26 4 123 75 140 0 41 75 2 2 1 9 0 00531 1 0 530148 40 7412185 71 530031 03 7412262 10 Geomodeller minimum number hot spots worm 4 Library Help Top 2012 Intrepid Geophysics 4 Back gt INTREPID User Manual Naudy Automatic Model interpretation T43 45 Library Help Top 4 Back gt 3D Body Data from naudyd to File D test_data FullTests naudyd_test mat_basil eni_d csv Original Worm count 79 Export to Geomodeller Worms 26 Total simple bodies used 100 Before thinning Mean length 6 576923 Max length 17 000000 After thinning Mean length 5 730769 Max length 10 000000 Exported 3D body Linear Summary from naudyd to File D test_data FullTests naudyd_test mat_basil Summary_eni_d csv Original Worm count 79 Geomodeller Linear Summary Dykes 26 Data created during the model specification Each time you view a line for which no model exists INTREPID calculates and refines the currently specified model for it This line then joins the collection of lines for which the model exists in the temporary file mentioned above If you change the s
23. INTREPID User Manual Naudy Automatic Model interpretation T43 1 Library Help Top 4 Back gt Naudy Automatic Model interpretation T43 i Library Help Top The Naudy Automatic Model tool is a powerful interpretation tool for inferring the size shape and position of magnetic sources using line data It can display The inferred geological structures with a profile of the original TMI data indicating similarity coefficients size shape and position A profile of a field calculated from the inferred geological structures overlaid in the original TMI data indicating the accuracy of the solutions e The extension to support Magnetic tensor gradients has been made during 2011 Very similar workflows are supported for this signal to the standard TMI case The main difference lie in the location of anomalies the determination of the magnetization vector direction and the verification that the anomaly is caused by a 2D geology structure This last point is particularly important as a TMI signal cannot be expected to provide this information The tool can then optimise the inferred structures by repeatedly 1 Calculating and comparing their field with the observed magnetic field then 2 Adjusting their size shape and position to improve the fit Naudy Automatic Model can save the results as an INTREPID or GEOSOFT points dataset in a format for importing to the Potent modelling package and joined into coherent shee
24. Lines Accept Cancel Library Help Top 2012 Intrepid Geophysics lt 4 Back gt INTREPID User Manual Naudy Automatic Model interpretation T43 46 Library Help Top Library Help Top 4 Back gt 4 Select the option corresponding to your line selection method Select from List Select a Range Select a Line Select All 5 If you selected Select from List move the line numbers between the Dataset Line Numbers and Selected Line Numbers list boxes as required The Selected Line Numbers list box shows a list of the lines for processing and the Dataset Line Numbers list box shows a list of lines that are not for processing To move a line number to the other list select click it so that it is highlighted then choose gt gt Add gt gt or lt lt Remove lt lt If you selected Select a Range enter the first and last line numbers to be processed into the corresponding text boxes If you selected Select a Line enter the number of the line required in the corresponding text box Note For Select a Range and Select a Line you can enter line numbers or the words start and end which signify the first and last line numbers 6 When you have specified the lines for processing choose Accept 7 INTREPID will process the dataset as specified 2012 Intrepid Geophysics lt 4 Back gt INTREPID User Manual Naudy Automatic Model interpretation T43 47 Library Help Top lt 4 Back gt Savi
25. R06 With V5 0 Intrepid we have introduced the GOOGLE protobuf language as a means of specifying all the data procesisng options for all tools in Intrepid and Geomodeller This has then also been published and you can find the Intrepid_tools proto file with any installed version of Intrepid Within this file a formal definition and lexicon for the options available within this Naudy tool are given One of the big advantages gained by this development is the unambiguous specification and the rigourous parser and checking of the task files together with explicit error reporting when you get it wrong gt gt To use a task specification file in an interactive Naudy Automatic Model session 1 Load the task specification job or task file File menu Load Options 2 Modify settings as required 3 Choose Process See Calculating the model for all or part of the dataset for instructions 4 Save the Naudy model point dataset if required See Saving the model as a point dataset for instructions gt gt To use a task specification file for a batch mode Naudy Automatic Model task Type the command naudyd exe with the switch batch followed by the name and path if necessary of the task specification file For example if you had a task specification file called surv329 job in the current directory you would use the command naudyd exe batch surv329 job old syntax naudyd exe batch surv329 task new syntax 2012 I
26. a dyke or a step Susceptibility Ka Magnetic susceptibility of inferred geological structure Similarity Similarity Similarity coefficient of inferred geological structure Strike Strike Absolute strike of inferred geological structure 0 North INTREPID initially obtains this from the line direction but may modify it during trend calculation Depth Z Depth estimate for inferred geological structure Depth_Bin_No new Naudy Automatic Model classifies solutions into groups bins by depth This field contains the bin number of the current inferred geological structure Depth_of_Bin new Depth of the bin group to which the current inferred geological structure belongs groupID new Field for use by users for their own purpose intended for manually classifying inferred geological structures into groups X X East West geographic location Y Y North South geographic location LineIndex Line Line number of line from which INTREPID derived the inferred geological structure LineBearing new Average bearing of line from which INTREPID derived the inferred geological structure calculated Naudy Automatic Model tool LineDp new Interpolation increment along line from which INTREPID derived the inferred geological structure Library Help Top 2012 Intrepid Geophysics 4 Back gt INTREPID User Manual Naudy Automatic Model interpretation T43 49 Library Help Top
27. al StdDev Nulls INTREPID displays basic observed field statistics for the current line Nyquist Frequency The highest frequency possible in the spectral domain given the current resampling ratel Sample Spacing Geographic resampling only This parameter corresponds to the distance between interpolated samples You can modify this to increase or decrease the resampling rate and thus the Nyquist frequency or use the Average Spacing the maximum and minimum values of the sample spacing are reported to the user Library Help Top 2012 Intrepid Geophysics 4 Back gt Naudy Automatic Model interpretation T43 22 INTREPID User Manual lt 4 Back gt Library Help Top Interpolation Method Use these options to specify Linear Cubic Spline Nearest Neighbours interpolation for the resampling data preparation process See Resampling mode for data preparation Cubic Spline interpolation uses a curve through a number of original data points on each side of the position for the resampled point Nearest neighbours uses a triangulation technique to determine the value for a position based on the values at neighbouring original data points Detrend Method INTREPID automatically detrends the input data field before displaying and modelling it in Naudy The user can choose which method to use when detrending Average Line Direction INTREPID displays the average bearing North towards the top as in a compass of the current line in
28. ameters Sensitivity Test Parameters v Always Regenerate Model Start Potent4 modelling session Here is an outline of the specification process The following sections give detailed instructions for each step gt gt To specify the Naudy Automatic Model process 1 Specify the Earth s core magnetic field if you wish to override the automatic calculation See Specifying the Earths core magnetic field data 2 You will firstly develop and test the model using individual lines Display a suitable line for this process You can display different lines at any time during specification and testing if required Ignore any default model that INTREPID displays for the line when it first appears 2012 Intrepid Geophysics lt 4 Back gt INTREPID User Manual Naudy Automatic Model interpretation T43 26 Library Help Top lt 4 Back gt 3 Select Interpret gt Model Parameters and set the Advanced Model options specified in the following dialog These options control the way your model search will be targeted to the geological geophysical environment of your survey and how solutions will be further filtered refined and reported For TMI aeromagnetic surveys we recommend 1 Dykes Use Naudy derived dips the aspect that is most susceptible to noise adjust poor dips calculate trends precompute the body strikes very important ao F WwW N No negative susceptibility Advanced Model Options Width
29. c location For chronological resampling Fiducial Fiducial count See Vector dataset field aliases in INTREPID database file and data structures R05 for more information about aliases Library Help Top 2012 Intrepid Geophysics lt 4 Back gt INTREPID User Manual Naudy Automatic Model interpretation T43 13 Library Help Top 4 Back gt Summary of file operations File menu options Load Lines Use this option to specify the line dataset for modelling INTREPID will prompt you to specify the line dataset the magnetic or gravity field to be modelled The resampling mode can be set by Right clicking in the top profile window once the dataset is loaded See Resampling mode for data preparation If you have selected geographic resampling and there are no valid X and Y aliases specifying the geographic location fields INTREPID will also display Open dialog boxes for you to specify them INTREPID will then open the dataset and display the profile of the first line in the Naudy Automatic Model main window For a tensor signal the tensoir must have been formed in the database as a proper tensor signal object Check via the jFmanager TAB for its data type If properly formed once you have chosen the magnetic tensor field the 6 components of the tensor are shown in the top panel in an analogous manner to the TMI Support for FTG or full tensor gravity gradiometry profile data is still in it
30. cations and parameter settings for Naudy Automatic Model load the corresponding task specification file using Load Options from the File menu See Specifying input and output files for detailed instructions If all of the specifications are correct in this file go to step 11 If you wish to modify any settings carry out the following steps as required 3 File gt Load Line Dataset Specify the dataset and Data field for the Naudy Automatic Model Use Load Line Dataset from the File menu See Specifying input and output files for detailed instructions Note the support for full tensor magnetic gradient signals The extension to gravity gradient signal is also a very viable possibility though the development and proving work is lagging F Data Type and Options TMI or FTMG C Yerical Derivative of TMI C Gravity FTG Beta OK Cancel Library Help Top 2012 Intrepid Geophysics 4 Back gt INTREPID User Manual Naudy Automatic Model interpretation T43 8 Library Help Top Library Help Top 4 Back gt INTREPID displays the first line from the dataset in the Naudy Automatic Model window lol x File Edit view Interpret Help Line 14100 Signal Field microlevelled Bearing 271 Scan f Invert f Process fj lt lt Previous Jj Goto fj Next gt gt Naudy solutions 4 File gt Save Model As Once you have completed your modelling run you must specify a new o
31. d and the dataset contains a Clearance field with the alias correctly set For Naudy solutions used to calculate inferred geological structures INTREPID will save this data in the Naudy model point dataset as field Z 2012 Intrepid Geophysics lt 4 Back gt INTREPID User Manual Library Help Top Library Help Top Scanning and Resampling dialog box options Naudy Automatic Model interpretation T43 32 lt 4 Back gt Use the upper two sections of the Model Parameters and Testing dialog box to specify and test this part of the process Model Parameters and Testing A Scan for Initial Solutions Starting Depth 80 00 m and Finishing at Depth 5900 00 m Depth below Sensor Restrict Max Absolute Susceptibilty to 9 1000 SI B Resample the Solutions rejecting those with Anomaly Amplitude less than 1 0000 nT Anomaly Amplitude greater than 1000 0000 nT OR Similarity Coefficient greater than 3 00 C Create the Model assuming a Line Spacing of 290 00 m Opt Refine the Model tor up to 5 Inversion Iterations OK Cancel If you wish to specify advanced options use the Advanced Model Options dialog box Choose Model Parameters from the Interpret menu to display this dialog box This dialog box is not designed to remain open like the Model Parameters and Testing dialog box You must choose
32. deller can manage the task This represents a very big boost in productivity for the geoscientist The Naudy depth cookbook also contains 2012 Intrepid Geophysics 4 Back gt INTREPID User Manual Naudy Automatic Model interpretation T43 43 Library Help Top Library Help Top lt 4 Back gt comments on this aspect F 3D body creation controller C bpe 3D BODY CREATION CONTROLS Strike comes from the trends Each profile contributes 2D Hot Spot Bodies Join Hot Spot Bodies using Line Spacing of 200 00 m M Calculate 3D Body Linear Approximations Strategies for thinning dyke fault data Always keep start and end points Minimum Original Hot Spot Points 4 l Force Normal polarity Pick Dykes Faults with best fitting RMS 50 l Finite Dykes Add zero thickness points at end For magnetic datasets if you allow negative susceptibility dyke solutions or use proximity strike for ring dyke solutions Accept All long thin 3D Bodies C Induced long thin 3D Bodies Only C Possibly Remanent Dykes C Find any Ring Dykes l Generate Run Forward model task file Use a facet formulae C Use a infinite thin sheet What response to calculate TMI C Magnetic Tensor GridName calculated_dyke _ers CellSize _100 00 OK Cancel The clustering algorithm developed here joins HOT_SPOT solutions in a recursive search for WORMS The
33. endicular to Line C Use a Fixed Body Strike of 9 00 gegrees 0 means true north C Calculate Trends requires even spaced parallel acq lines Edit Trend filters OK Cancel Turn on the check boxes according to your requirements then choose Accept If you turn on the Automatically Invert option INTREPID will be automatically refining the model whenever you create a model for a line Specify the required number of inversion iterations in the corresponding text box next to the Opt Refine the Model button in the Model Parameters and Testing dialog box See Refining inferred structures and optimising the calculated field for details about this parameter 2012 Intrepid Geophysics 4 Back gt INTREPID User Manual Naudy Automatic Model interpretation T43 42 Library Help Top lt 4 Back gt Illustration of length and body strike The following illustration shows the effect of the line spacing and the body strike data on the inferred geological structures You are asked to specify the line spacing as a parameter Length and strike of inferred geological structures Aquisition lines viewed from above Represents a gt Naudy source Before INTREPID calculates the length the inferred geological structures have infinite length INTREPID assigns a length equal to the dataset line spaci
34. eries of 1D filters to create high pass bumps in the profiles that can be matched between lines thereby estimating local strike of the geology The deeper strucural trends are allowed to be different to the surface trends via a similar 1D filtering strategy This approach overcomes one of the main limitations to automation of the Naudy algorithm when dealing with TMI data that is the error in depth and body shapes when there is a strike error Other implimentations tend to apply a strike correction after the body is found assuming a body normal to the profile With this implimentation all the complications of a post fix go away Of course in the tensor case a strike is directly implied in the ratio of the 2 invariants of the tensor signal The zero eigenvector for a 2D body lies in the strike direction V Active naudyShallowTrendFilter fdf Amplitude Tolerance _050 V Active naudyDeepTrendFilter fdf Amplitude Tolerance 0 50 l Active naudyYeryDeepTrendFilter fdf Amplitude Tolerance _0 50 Connect Trends with angles that differ by less than Degrees Use a Search Rectangle of size Line Spacings Across Line Strike Use a Search Rectangle of size Line Spacing Along Line Strike OK Cancel 2012 Intrepid Geophysics 4 Back gt INTREPID User Manual Naudy Automatic Model interpretation T43 41 Library Help Top 4 Back gt Search complexity and refinement options Library Help Top
35. f order 0 strike issues 0 dip issues 3D Body Data from naudyd to File joiningWorms5 csv Original Worm count 79 Export to Geomodeller Worms 26 Total simple bodies used 99 Conditioned sorted worm step 7 duplicate bodies 0 out of order 0 strike issues 0 dip issues Final Worm count 79 After a recursive joining process number of WORMS Lines with unknown strike 0 Box tests 85589 angle tests 378 proximity tests 349 Join Worm Recursive level 5 Conditioned sorted worm step 6 duplicate bodies 0 out of order 0 strike issues 0 dip issues Linearization Summary Dyke nPts Strike Dip Length Thickness Linear_deviation RMS ERROR Susceptibility Similarity startx sY endx eY Dykel 4 142 80 164 3 37 39 5 0 0 7 0 00291 1 0 531844 31 7410115 06 531743 70 7410244 94 Dyke2 17 128 76 818 4 43 89 8 9 25 7 0 03926 1 1 531967 40 7410554 50 531324 06 7411060 33 Dyke3 6 144 68 338 9 37 66 8 0 7 8 0 01460 0 9 531659 58 7410075 37 531465 14 7410352 89 Dyke4 4 102 71 147 3 51 46 10 2 0 6 0 00207 1 4 532252 90 7411351 51 532109 05 7411383 44 Dyke5 16 133 78 775 1 42 67 8 7 31 3 0 04236 0 7 531333 02 7410258 57 530769 80 7410791 05 Dyke6 6 129 77 258 5 55 84 11 0 33 9 0 04088 1 1 531298 11 7410571 88 531099 53 7410737 36 Dyke7 15 131 72 758 4 52 25 15 2 11 3 0 02641 1 1 531061 91 7410354 83 530492 76 7410856 13 Dyke8 4 148 82 137 4 70 19 9 3 29 6
36. for Naudy solutions for details about this parameter See Depth in Finding and resampling Naudy solutions for details about the depth result The similarity coefficient values in the legend Similarity colour mode correspond to the possible values for this calculated result See Finding and resampling Naudy solutions for details about this result Change mode Choose this to switch between the Depth Similarity or Trend colour displays Close Choose this to close the Plan View window Library Help Top 2012 Intrepid Geophysics 4 Back gt INTREPID User Manual Naudy Automatic Model interpretation T43 25 Library Help Top 4 Back gt Specifying the modelling process Library Help Top This section describes how to specify the Naudy Automatic Model process During the specification process you will calculate and view the results for your specifications for individual lines as required for optimising the specifications This calculating and viewing is intended only to assist you with the specifications When you are ready to calculate the model for the dataset you will use the Process button in the Naudy Automatic Model window See Calculating the model for all or part of the dataset for instructions about this next step You can specify the Naudy Automatic Model using options from the Interpret menus jas Intrepid Automatic Modelling File Edit View Interpret Help Earth s Magnetic Field Model Par
37. gin Field Begin InducingFieldIntensity 51649 9080802049 InducingFieldAzimuth 3 8918163236731 InducingFieldInclination 51 896640692569 Field End NaudyOptions Begin AutoIGRF 1 VerticalDerivative 0 StartDepth 70 0 EndDepth 2000 0 WindowFactor 1 5 MinAmplitudeCutoff 0 0 MaxAmplitudeCutoff 100 0 BodyStrike 0 0 LineSpacing 200 0 DipRange 0 WidthRange 0 UseDerivedDip 1 if trying to dip match more exactly at the surface for a BIF naudyUseFinerSampling 0 now for model body types UseStep 0 Library Help Top 2012 Intrepid Geophysics lt 4 Back gt INTREPID User Manual Naudy Automatic Model interpretation T43 54 Library Help Top lt 4 Back gt UseString 0 UseDyke 1 options for admisable bodies allowNegativeSusc 0 AlwaysInvert 1 CullOnNaudyDip 1 FixOnNaudyDip 1 DumpSimilarity 1 solver assumes a vertical section so XY coords not alwys on a real profile ForceOntoProfile 1 MaxInvertIterations 5 Threshold 3 0 BT_DYKE BT_SLAB BodyCode BT_DYKE NaudyOptions End WormOptions Start Geomodeller_minimum_number_hot_spots 4 CreateDykeLinears 1 RequiredMagnetization_Worms MAG ALL MakeFiniteDykes 1 CullReversePolarity 1 make sure the right hand rule is being applied BestFitting 1 BestFittingPercent 50 just take best fitting solutions 50 of them WormOptions End Trends Begin ST_PERPENDICULAR ST_USER ST_TRENDS ST_CALC StrikeCode ST_CALC Sha
38. gt Navigating the profile and model display Library Help Top In the upper data display section the Naudy Automatic Model window shows in black a profile of the observed field for a single line and in red the current calculated field from the current model These profiles are The original input data field and The current calculated field The horizontal scales of the input or observed field and calculated field are synchronised so that you can compare corresponding values for any data point You can navigate the dataset display in the following ways Viewing the profile of any line in the dataset Zooming in on any section of a profile or model solution Selecting a line you wish to view When you first load a line dataset INTREPID displays the input data for the first line in the dataset You can display other lines using the Next Previous and Go To command buttons The Naudy Automatic Model automatically sorts line numbers into ascending order irrespective of their actual order in the dataset When you view a line in the Naudy Automatic Model main window Ifthe option Always Regenerate Model in the Interpret menu is turned on Default then INTREPID always recalculates and displays the inferred geological structures and calculated field even if a prior model exists for that line e Ifthe option Always Regenerate Model in the Interpret menu is turned off and a model exists for the line INTREPID will display
39. he input line dataset in metres INTREPID will set the length of the inferred geological structures the dimension perpendicular to the line direction viewed from above equal to this value and record the length in the D field of the Naudy model point dataset See Illustration of length and body strike for a diagram showing inferred geological structure length 2012 Intrepid Geophysics 4 Back gt INTREPID User Manual Naudy Automatic Model interpretation T43 37 Library Help Top 4 Back gt Refining inferred structures and optimising the calculated field Library Help Top After INTREPID has calculated the inferred geological structures it can refine them by modifying their Width parallel to the line direction Depth e Horizontal position e Dip and or Susceptibility The goal of the refinement process is to arrive at a set of inferred geological structures whose calculated field most closely matches the observed field along the line The refinement process is self conditioning Its effectiveness improves within a single set of iterations Thus one set of 20 iterations is more effective than two sets of 10 You can perform the refinement process more than once if required Increase the maximum number of iterations if you find that repeated refinement is necessary The Automatically Invert option Advanced Model Options If you select the Automatically Invert check box in the Model Parameters
40. ically calculate and refine the model with the current settings for any line that you display You need to close the the Modelling Parameters and Testing dialog box before viewing different lines Model Parameters and Testing A Scan for Initial Solutions Starting Depth 80 00 m and Finishing at Depth 5000 00 m Depth below Sensor Restrict Max Absolute Susceptibilty to 0 1000 SI B Resample the Solutions rejecting those with Anomaly Amplitude less than 1 0000 nT Anomaly Amplitude greater than 1000 0000 nT OR Similarity Coefficient greater than 3 00 C Create the Model assuming a Line Spacing of 290 00 m Opt Refine the Model tor up to 5 Inversion Iterations OK Cancel 5 Specify and search for Naudy solutions 6 Specify the resampling criteria and resample the Naudy solutions 7 Create the model for the line INTREPID displays initial inferred geological structures and the calculated field profile 8 Refine the model by adjusting the inferred geological structures 9 Choose OK to close the Model Parameters and Testing Sensitivity Test Parameters dialog box 10 If required return to the Advanced Modelling Options Model Parameters dialog to revise the search target style complexity and solution refinement filtering options for processing the whole dataset ie Calculate trends remove
41. ing and resampling Naudy solutions Library Help Top gt gt To calculate Naudy solutions for a line including similarity coefficient position and depth 1 Specify the depth range to search then calculate the Naudy solutions You can also specify advanced options the width of the Naudy operator the depth increment and the body strike See Scanning for Naudy solutions for details 2 Resample and thin out the Naudy solutions Specifying a maximum similarity coefficient and minimum amplitude for inclusion and Selecting the solution with the lowest similarity coefficient if several solutions occur close to each other See Resampling the Naudy solutions for details Similarity coefficient This is a measure of the similarity between the calculated field of a Naudy solution and the observed field Similarity coefficients range from 0 to 5 where 0 represents a good match and 5 represents zero similarity For Naudy solutions used to calculate inferred geological structures INTREPID will save this data in the Naudy model point dataset as field Similarity Position The scanning process calculates the location of Naudy solutions For Naudy solutions used to calculate inferred geological structures INTREPID will save this data in the Naudy model point dataset as fields X and Y Depth The scanning process calculates the depth below the data acquisition height of Naudy solutions or below the ground if the Clearance option is selecte
42. ing the survey date 1 January 1980 We regard this as sufficiently accurate for the purposes of the Naudy Automatic Model tool You can override this automatic calculation if required and enter your own field intensity inclination and declination See The geomagnetic reference field in INTREPID R15 for a discussion of this topic gt gt To specify the Earth s core magnetic field data for this Naudy Automatic Model session 1 Choose Earth s Magnetic Field from the Interpret menu INTREPID displays the Set Field Components dialog box Earth s Magnetic Field Either used constant GRF of Intensity 52000 00 nT Inclination 52 00 degrees Declination 5 00 degrees V Calculate IGRF using dataset Survey Year 2008 OK Cancel 2 Specify the Field Strength intensity Declination and Inclination 3 Turn off the Calculate IGRF using Dataset check box 4 Choose OK gt gt To automatically calculate the Earth s core magnetic field data from the dataset This is the default state for the tool 1 Choose Earth s Magnetic Field from the Interpret menu INTREPID displays the Set Field Components dialog box 2 Turn on the Calculate from Dataset check box 3 Choose Accept Library Help Top 2012 Intrepid Geophysics 4 Back gt INTREPID User Manual Naudy Automatic Model interpretation T43 31 Library Help Top 4 Back gt Find
43. its inferred geological structures and calculated field See Viewing and recalculating individual lines during the specification process for details about model recalculation for individual lines See Calculating the model for all or part of the dataset for further information about obtaining an up to date model for a desired set of lines 2012 Intrepid Geophysics 4 Back gt INTREPID User Manual Naudy Automatic Model interpretation T43 19 Library Help Top lt 4 Back gt gt gt To view the Next or Previous line according to line number 1 Ifthe Automatic Modelling Options and Testing dialog box is open close it Choose Accept or Cancel 2 Use Next or Previous from the Naudy Automatic Model window to view the next or previous line respectively gt gt To view the line of your choice 1 Ifthe Automatic Modelling Options and Testing dialog box is open close it Choose Accept or Cancel 2 Choose Go To in the Naudy Automatic Model window INTREPID displays the Select Line dialog box 3 Select click the number of the line you wish to view then choose OK INTREPID displays the line Enlarging and reducing zooming the profile display You can enlarge the profile display zoom in to display only part of a line profile then zoom out again when you have finished When you zoom in INTREPID will Always synchronise the horizontal scale of the two data areas Set the vertical scale of the field
44. k gt geological structures Naudy model The assemblage of inferred geological structures calculated for all or part of a dataset Naudy model point dataset Point dataset created by the Naudy Automatic Model tool containing Naudy model data Naudy sources Naudy solutions An initial calculation derived from the observed magnetic field indicating potential sources for the field and leading to the calculation of inferred geological structures MTDYKE This is a companion tool that can take the direct WORMS output from Naudy via the CSV file format and predict on to a draped elevation grid the forward model response of the dykes that have been found In this case each HOT_SPOT body is modelled Alternatively the tool also has provision for modelling the full 3D sheet like triangulated description of the same dykes as calculated by geomodeller Observed field TMI Vertical derivative of TMI Magnetic tensor gradients FTMG or Gravity tensor gradients FTG field recorded in the input line dataset for which you wish to calculate inferred geological structures Potent modelling package A software package published by PC Potentials which enables you to perform interactive magnetic and gravity forward and inversion modelling Refining inferred geological structures After calculating Naudy solutions and initial inferred geological structures INTREPID can automatically refine them by repeatedly adjusting their size and position a
45. lSampling false allowNegativeSusc false AlwaysInvert false CullOnNaudyDip true FixOnNaudyDip true DumpSimilarity false ForceOntoProfile false MaxInvertIterations 5 MaximumBodySimilarityToKeep 3 0 keep better solutions with similarity less than 3 RemoveClearance true BodyType Dyke look for dykes Geomodeller_minimum_number_hot_spots 4 Create3D_DykeLinears true Trends StrikeCode ST CALC estimate the strikes trends 2012 Intrepid Geophysics 4 Back gt INTREPID User Manual Naudy Automatic Model interpretation T43 52 Library Help Top lt 4 Back gt within the survey ShallowFilter naudyShallowTrendFilter fdf DeepFilter naudyDeepTrendFilter fdf VeryDeepFilter naudyVeryDeepTrendFilter fdf ShallowTolerance 2 0 DeepTolerance 5 0 VeryDeepTolerance 0 5 AlongLine 3 0 AcrossLine 3 5 Worms OutputGeomodeller ebagoola_dykes csv Geomodeller_minimum_number_hot_spots 4 CreateDykeLinears true RequiredMagnetization_Worms MAG_ALL MakeFiniteDykes true CullReversePolarity true make sure the right hand rule is being applied BestFitting true BestFittingPercent 50 just take best fitting solutions 50 of them The older V4 syntax but still support for now is shown following Process Begin Name naudyd Parameters Begin LineIO Begin InputLines disk1 survey ebagoola LineIO End NaudyOptions Begin InducingFieldIntensity
46. lative change in magnetic signal that is most important for determining location of magnetic bodies Vertical axis in the lower plot The vertical scale in the lower plot represents depth in metres below observation height or ground level if the Remove Clearance option is chosen The body depth to top is corrected for aircraft clearance RADALT in this case The cross on top of each modelled body directly marks the top of the magnetic source The size of this cross corresponds directly to the slenderness ratio of the modelled body Inferred geological structure colours The Naudy model display colour indicates the inferred geological structure s similarity coefficient Red indicates a high quality solution less than 2 Blue indicates medium quality between 2 and 3 The legend in the model display area is a guide to these colours ia Intrepid Automatic Modelling File Edit View Interpret Help Line 100910 Signal Field FINALMAG Bearing 89 Scan inven Process lt Previous JN Goto Now gt gt Nau dy solutions CLICK TOP OF BODY RIGHT FOR INFORMATION LEFT TO EDIT CTAL LEFt 8 Done Fitting RMS body 9 07 4 bodies See Finding and resampling Naudy solutions for details about the similarity coefficient Library Help Top 2012 Intrepid Geophysics 4 Back gt INTREPID User Manual Naudy Automatic Model interpretation T43 18 Library Help Top 4 Back
47. lexity of the search and whether to perform model refinement See Search complexity and refinement options for details Ifyou display a line for which a model exists and the Always Regenerate Model option in the Interpret menu is turned off INTREPID displays the existing model for the line If you wish to recalculate the model using the current specifications simply choose as many buttons from the sequence Scan Resample Create the Model and Refine the Model as required to update the calculations for the line To continue model specification with the newly displayed line simply display the Model Parameters and Testing dialog box and continue See Selecting a line you wish to view for details about displaying different lines At any stage during or after the specification process you can transfer the current line to the Potent modelling software by selecting Interpret gt Start Potent 4 Modelling Session from the main menu bar 2012 Intrepid Geophysics lt 4 Back gt INTREPID User Manual Naudy Automatic Model interpretation T43 30 Library Help Top lt 4 Back gt Specifying the Earth s core magnetic field data The Naudy Automatic Model tool requires an Earth s core magnetic field data for use in its calculations It requires the data for a horizontal and vertical component calculation and for producing the calculated field INTREPID normally calculates the Earth s core magnetic field data from the IGRF model us
48. llowFilter naudyShallowTrendFilter fdf ShallowFilter naudyDeepTrendFilter fdf DeepFilter naudyDeepTrendFilter fdf VeryDeepFilter naudyVeryDeepTrendFilter fdf ShallowTolerance 2 DeepTolerance 5 VeryDeepTolerance 5 Rectangle Begin AlongLine 3 0 AcrossLine 3 5 Rectangle End Trends End ProcessParameters Begin ALL LINES SINGLE LINE LINE_RANGE LINE_SELECTION Process ALL _ LINES StartLineNumber 7754400 EndLineNumber 776200 NoOfLines 20 XY_BASED FID BASED FIXED MODE SampleMode XY_BASED ProcessParameters End Parameters End Process End Library Help Top 2012 Intrepid Geophysics lt 4 Back gt
49. nd Testing dialog box 3 Choose Scan INTREPID will calculate and display the Naudy solutions Starting depth Finishing at depth Use these to specify the depth range for finding and reporting Naudy solutions INTREPID will not calculate solutions outside this range Restrict Maximum Absolute Susceptibility Use this parameter to limit the range of predicted absolute susceptibility 2012 Intrepid Geophysics 4 Back gt INTREPID User Manual Naudy Automatic Model interpretation T43 34 Library Help Top Library Help Top lt 4 Back gt Width of Naudy operator as a multiple of depth Advanced option INTREPID uses a variable number of data points for calculating solutions depending on the depth of the solution The number of data points used is a multiple of the depth of the solution This parameter specifies the factor for the number of data points used for each depth The default value is 2 If the Naudy operator is too wide INTREPID may inadvertently introduce part of a neighbouring anomaly into the calculation If it is too narrow INTREPID may only examine the peak of an anomaly and fail to obtain information about its true shape Increase successive depths by a factor of Depth increment Advanced option Use this to specify the depth increment factor dif INTREPID divides the depth range into sections according to the depth increment factor The depth section closest to the surface has a height equal
50. nd comparing the calculated field with the observed field See Refining inferred structures and optimising the calculated field Resampling mode data preparation When preparing line data for the Naudy Automatic Model INTREPID resamples it so that the data points are evenly spaced along the line You can specify whether the even spacing is geographic based on the X and Y fields or chronological based on the Fiducial field See Resampling mode for data preparation Resampling Naudy solutions After calculating Naudy solutions INTREPID selects the best ones for the next stage of the process See Resampling the Naudy solutions Similarity coefficient A measure of the similarity between the calculated field of a Naudy solution and the observed field Similarity coefficients range from 0 to 5 where 0 represents perfect match and 5 a low similarity Method is based on scaled autocorrelation between the measured and calculated horizontal and vertical field components of the symmetric parts of the signal profiles See Finding and resampling Naudy solutions Source region See definition of Distance factor above for an explanation Threshold A cutoff value for similarity coefficients above which INTREPID will reject a Naudy solution during the resampling process See Resampling the Naudy solutions TMI See definition of Total magnetic intensity TMD field below Total magnetic intensity TMI field INTREPID uses the total magnetic i
51. ng before saving the model solutions point dataset If you specify and enable a spline gridding sample points dataset INTREPID assigns a strike to each structure before saving the model solutions point dataset Calculating the model for all or part of the dataset After you have specified the Naudy Automatic Model process you can apply it to some or all lines in the dataset You can calculate and refine the model for a list of lines a range of lines a single line or all lines INTREPID automatically saves the model values in a temporary output dataset The user must select File gt Save Model As to save his own set of output models 3D Dyke Geometry Library Help Top The option uder the File menu to export the final emsemble to Geomodeller format produces after a clustering of the soltuions an ordered list of HOT_SPOT bodies in a csv file with each identified 3D dykes s points sorted into a following order with a newly created TAG eg DYKE1 2 etc Geomodeller s implicit geology modelling algorithms are clever enough to then turn these foliation observations into 3D surfaces that are either finite or continue right across the project The Tutorial K exercise distributed with Geomodeller illustrates this functionality There is obviously enough information contained in this automatic interpretation of magnetic survey data to accomplish a good starting point in any 3D geology modelling environment if Geomo
52. ng the current model results As INTREPID performs model calculations it saves them to a temporary points dataset During or after the model specification and testing process you can save the currently displayed line s model to your own points dataset Saving the model as a point dataset gt gt To save the output dataset Use Save Model As from the File menu as required Exit To exit from Naudy Automatic Model choose Quit from the File menu Library Help Top 2012 Intrepid Geophysics lt 4 Back gt INTREPID User Manual Library Help Top Naudy Automatic Model interpretation T43 48 lt 4 Back gt Structure of Naudy model point datasets Each data point on a Naudy model point dataset represents an inferred geological structure Naudy model point datasets have the following fields Field new Field old Description Width A Width of inferred geological structure in the line direction before the body strike is changed by trend calculation Dip B or D Dip of inferred geological structure rotation about axis perpendicular to the line direction DepthExtent Cc Height depth extent of inferred geological structure Length D or B Length of inferred geological structure perpendicular to the line direction before the body strike is changed by trend calculation BodyType BodyType Code indicating whether inferred geological structure is
53. ntensity field as the source of data for calculating the Naudy model References to the Z field of the input dataset in this chapter mean its TMI field Trend points See definition of Spline gridding sample points above 2012 Intrepid Geophysics 4 Back gt INTREPID User Manual Naudy Automatic Model interpretation T43 4 Library Help Top lt 4 Back gt Trend grid A grid created using the trend spline gridding process See Specifying body strike for the Naudy model point dataset Vertical derivative of TMI INTREPID is also able to use the first vertical derivative of TMI as the source for calculating the Naudy model Signal field In this chapter references to the signal field of the input line dataset mean the TMI Vertical derivative of TMI magnetic tensor gradients or Gravity tensor gradients field The field called Elevation in Naudy model point datasets contains the estimated Depth to the top of the source model after correction for Clearance if requested Library Help Top 2012 Intrepid Geophysics lt 4 Back gt INTREPID User Manual Naudy Automatic Model interpretation T43 5 Library Help Top lt 4 Back gt Using the Naudy Automatic Model tool The flowchart shown here shows the essential steps in the Naudy Automatic Model process Library Help Top 2012 Intrepid Geophysics lt 4 Back gt INTREPID User Manual Naudy Automatic Model interpretation T43 6 Library Help To
54. ntrepid Geophysics 4 Back gt INTREPID User Manual Naudy Automatic Model interpretation T43 51 Library Help Top lt 4 Back gt Task specification file notes and example Library Help Top Here is an example of a Naudy Automatic Model task specification file Example task file V5 0 protbuf syntax naudy manual or automatic outputs combine all the by line solutions into a coherent worm dyke for use in Geomodeller Usage fmanager batch ebagoola_geomodeller_export task IntrepidTask Naudy InputLines datasets ebagoola_S DIR InputSignal datasets ebagoola_S DIR smooth_mag InputClearance datasets ebagoola_S DIR radAlt OutputNaudyModel datasets ebagoola_naul DIR ReportFile ebagoola_geomodeller rpt MagneticField Magnitude 56959 39 Declination 6 25 Inclination 62 5 SurveyYear 2004 SurveyMonth 1 SurveyDay 1 processType ALL_LINES do full survey SampleMode XY_BASED treat spatially VerticalDerivative false use the TMI AutoIGRF true turn on for StartDepth 70 0 No bodies in the air gap EndDepth 2000 0 WindowFactor 1 5 MinAmplitudeCutoff 1 0 1 nT noise floor MaxAmplitudeCutoff 100 0 highest anomaly to consider LineSpacing 400 0 DipRange false just start with vertical WidthRange false just one aspect ratio of width to depth UseDerivedDip true use the estimated dip UseFinerVertica
55. of Naudy operator 1 50 x Depth l Remove clearance from body depths Average Survey Clearance 59 05 M Dump all similarity data for current line M Allow Negative Susceptibility l Automatically Invert when Calculating Model Depth Bias Increase successive depths by a factor of 1 20 l Finer Sampling with Depth Shallower Solutions Body Type Dykes Steps allow prism formation C Intra sediments Dykes some Steps Steps some Dykes V Use range of widths for Dykes Intrased Dip Search Strategy Always vertical C Use Naudy Derived Dips C Best of 45 90 135 Dip Accept Strategy Accept everything ignore bad naudy dips C Reject Bad Naudy Derived Dips gt 45deg_ from vertical dip C Adjust Poor Naudy Derived Dips Error gt 30 Body Strike Options Set Bodies Perpendicular to Line C Use a Fixed Body Strike of 0 00 gegrees 0 means true north Calculate Trends requires even spaced parallel acq lines Edit Trend filters OK Cancel Library Help Top 2012 Intrepid Geophysics 4 Back gt INTREPID User Manual Naudy Automatic Model interpretation T43 27 Library Help Top lt 4 Back gt 4 Select Interpret gt Sensitivity Test Parameters and the Model Parameters and Testing dialog box It will remain open while you develop and test the model You will use it for steps 4 7 View different lines of the dataset and zoom in and out INTREPID will automat
56. ofile and model display Querying lines and setting resampling options and Plan view for detailed instructions Library Help Top 2012 Intrepid Geophysics lt 4 Back gt INTREPID User Manual Naudy Automatic Model interpretation T43 10 Library Help Top 10 11 12 13 14 4 Back gt Specify the search complexity for the process and whether you wish to refine the inferred geological structures using the inversion process See Search complexity and refinement options for detailed instructions Start a Potent 4 modelling session from the Interpret menu for the currently displayed line s model Save the existing Naudy model point dataset at any point in the modelling process Reloading model point datasets is no longer possible in INTREPID V4 2 2 See Specifying input and output files for detailed instructions Interpret gt Earths Magnetic Field Specify the Earth s core magnetic field data for the survey if you wish to override the automatic calculation from the IGRF model See Specifying the Earth s core magnetic field data for detailed instructions Interpret gt Model Parameters Select the required parameters from the Advanced Model Options You can remove the Clearance from the estimated body depths and specify the search complexity for the process and whether you wish to refine the inferred geological structures using the inversion process See Search complexity and refinement options for detailed
57. other first for potential field geophysics from INTREPID Horst Holstein has delivered most of the required modelling and inversion theroy here Anglo DeBeers have also pushed the developement of the magnetic Tensor survey technique to make it quite viable and now best magnetic survey practice ipht3zena Towed bird design streamlined shape for motion noise reduction Design D Taylor Epsilon Engineering 2012 Intrepid Geophysics lt 4 Back gt INTREPID User Manual Naudy Automatic Model interpretation T43 29 Library Help Top 4 Back gt Viewing and recalculating individual lines during the specification process Library Help Top You can view different lines during the specification process Before changing to another line you must close the Model Parameters and Testing dialog box INTREPID displays inferred geological structures and calculated field for the newly displayed line according to the following rules When you view a different line Ifyou display a line for which no model exists and the Always Regenerate Model option in the Interpret menu is turned on INTREPID will immediately calculate and display the model for the line using the current settings INTREPID will perform the model calculation for the new line according to the parameters you have set in both the Model Parameters and Testing and Advanced Modelling Options dialog boxes The parameters controlling the process include the comp
58. p 4 Back gt Naudy Automatic Model process oad line dataset amp select data field for processing Specify Naudy report file for process log Select a line for testing the model A Scan for Naudy solutions Revise sensitivity options Set Body depth limits Set Amplitude limits Set Similarity limit Set Line spacing etc B Resample Naudy solutions C Create Naudy model Refine Naudy model using Inversion Clear model solutions fo current line or all lines Naudy op Body type Dip search strategy iner sampling clearance Specify body strike or Calculate trends across lines to improve model strike width depth calcs Start a Potent modelling session for current line Process all lines or selected lines or a line number is Save model results trends to point datasets View plan window Export to MapComp Library Help Top 2012 Intrepid Geophysics lt 4 Back gt INTREPID User Manual Naudy Automatic Model interpretation T43 7 Library Help Top lt 4 Back gt gt gt To use Naudy Automatic Model with the INTREPID graphic user interface 1 Choose Naudy Auto Model from the Interpretation menu in the Project Manager or use the command naudyd exe INTREPID displays the Naudy Automatic Model Main window E Intrepid Automatic Modelling CEEA File Edit Vie Interpret Help 2 File gt Load Options If you have previously prepared file specifi
59. pecifications for the model and a previously viewed line is then not included in your selection of lines to be processed it will remain in the Naudy model point dataset even though it may have undesirable or out of date results In order to prevent this from happening use the Edit gt Clear Model for Current Line or Clear Model for All Lines options before commencing the formal processing of the dataset INTREPID will overwrite the model results for any lines that you have previously displayed and are included in your selection of lines to be processed Performing the model calculation on the selected lines gt gt To perform the model calculation and refinement process if selected for specified lines in the dataset 1 Ensure that you have specified according to your requirements The model The search complexity and refinement options and The calculate trends option is turned on for regularly spaced lines 2 Save the output models when you have completed your processing using File gt Save Model As 3 Choose Process from the Naudy Automatic Model window INTREPID displays the Lines to Model dialog box Input Directory D intrepid tutorials data ebagoola_ST Output Z field UNKNOWN C Select from List Data Set Line Numbers Selected Line Numbers gt gt Add gt gt lt lt Remove lt lt C Select A Range From Start C Select A Line Line Number Start SelectAll
60. perator 1 50 x Depth l Remove clearance from body depths Average Survey Clearance 59 05 M Dump all similarity data for current line M Allow Negative Susceptibility Automatically Invert when Calculating Model Depth Bias Increase successive depths by a factor of 1 20 Finer Sampling with Depth Shallower Solutions Body Type Dykes Steps allow prism formation Intra sediments Dykes some Steps Steps some Dykes MV Use range of widths for Dykes Intrased Dip Search Strategy Always vertical C Use Naudy Derived Dips C Best of 45 90 135 Dip Accept Strategy Accept everything ignore bad naudy dips C Reject Bad Naudy Derived Dips gt 45deg_ from vertical dip C Adjust Poor Naudy Derived Dips Error gt 30 Body Strike Options Set Bodies Perpendicular to Line C Use a Fixed Body Strike of 0 00 degrees 0 means true north C Calculate Trends requires even spaced parallel acq lines Edit Trend filters OK Cancel 2012 Intrepid Geophysics 4 Back gt INTREPID User Manual Naudy Automatic Model interpretation T43 40 Library Help Top Library Help Top lt 4 Back gt Turn on Calculate Trends and specify the trend filters the Connect Trend angles limit in degrees and the Search Rectangle sizes for the across and along line trend search in the Advanced Trend Detection Filter Options dialog box shown below This option relies on designing a s
61. posed on the black original observed line profile INTREPID will perform the model calculation according to the parameters you have set in both the Automatic Modelling Options and Testing and Advanced Options dialog boxes If you have turned on either of the Always Invert options INTREPID will automatically refine the model after creating it See Refining inferred structures and optimising the calculated field for details about the refinement process See Search complexity and refinement options for details about the Always Invert options The following step assumes you have scanned for Naudy solutions and resampled them and that the Automatic Modelling Options and Testing dialog box is open gt gt To calculate the model and display the inferred geological structures 1 Specify the line spacing for the model C Create the Model assuming a Line Spacing of 290 00 m 2 Choose Create the Model INTREPID will calculate and display the inferred geological structures It will also display the calculated field in red superimposed on the black observed field profile Depending on the search complexity and refinement options it may also refine the model The following illustration shows a model calculated with all of these options turned off Intrepid Automatic Modelling Tool 3 2 Line i 30180 Z Dataret MAG Beating 270 T Le Assuming a line spacing of Use this to specify the line spacing of t
62. r input data field that can be used to infer the body strike Kdit Trend Filters Clicking on this button opens the following dialog box with options for controlling the estimation of trends for your input data field Advanced Trend Detection Filter Options V Active naudyShallowTrendFilter fdf Amplitude Tolerance _050 V Active naudyDeepTrendFilter fdf Amplitude Tolerance 0 50 l Active naudyYeryDeepTrendFilter fdf Amplitude Tolerance _0 50 Connect Trends with angles that differ by less than Degrees Use a Search Rectangle of size Line Spacings Across Line Strike Use a Search Rectangle of size Line Spacing Along Line Strike OK Cancel 2012 Intrepid Geophysics 4 Back gt INTREPID User Manual Naudy Automatic Model interpretation T43 35 Library Help Top Library Help Top lt 4 Back gt Resampling the Naudy solutions The following steps assume that you have Selected and displayed a line Scanned it for Naudy solutions and Displayed the Model Parameters and Testing dialog box gt gt To resample Naudy solutions 1 Specify the similarity coefficient and intensity thresholds for rejecting inferior solutions 2 Ifrequired specify the advanced options Width of Naudy operator Depth Bias factor and Finer Sampling with Depth option 3 Choose Resample INTREPID will resample the collection of Naudy solutions rejecting those with similarity coefficient above the threshold
63. re is a comprehensive report in the log file as to how many simple bodies there are to begin with and how the joining has managed to reduce the candidate 3D dykes to a more manageable set The use of the inversion RMS measure to further cull HOT SPOT solutions from each 3D worm means that you are not over specifying foliation data along the dyke while still capturing its variable width and susceptibility estimates You can bias the search to the more linear of features or the other way to favour ring dykes You can choose the option to allow you to add pinch out points at the end of dykes that might fade within the project boundary thus allowing you to create a 3D model with dykes having limited extents At the bottom of this dialog there is the options for calculating a geophysical grid with the newly sorted WORM bodies The option of using the infinetly thin body formulatioin which is then post multiplied by a dyke thickness or a slower 3D facet model of the worms is given What is happening behind the scenes is the creation of a V5 0 protbuf message passing the DYKE geometry and properties to the MTdyke tool to do the required job This gives you a quick ability to see how much of the observed signal has been captured by the DYKE model Worm Formation Log The following is a sample report extracted from the naudy_depths log file that is 2012 Intrepid Geophysics 4 Back gt INTREPID User Manual Library Help
64. s infancy as this Naudy method has traditionally been associated with magnetics The quality and signal content in modern FTG profile data does however allow for an extension of this tool to support FTG data INTREPID saves model data to a temporary dataset whenever it performs a model calculation operation Saving the model results to a database file of your own is not required until the end of a session See Calculating the model for all or part of the dataset and Saving the model as a point dataset for details Load Existing Model You can not load an existing Naudy model point dataset for continuing work in version 4 5 but you can at V5 0 of Intrepid Save Model As Use this to save your current results Naudy model point dataset Load Options If you wish to use an existing task specification file to specify the Naudy Automatic Model process use this option to select the task specification file required INTREPID will load the file and use its contents to set all of the parameters for the Naudy Automatic Model process See Displaying options and using task specification files for more information Save Options If you wish to save the current Naudy Automatic Model file specifications and parameter settings as a task specification file use this option to specify the filename and save the file See Displaying options and using task specification files for more information File operations from the Interpret menu Load Trend Point Data U
65. se this option to load a previously saved trends dataset to assist with calculating the strike of the inferred geological structures See Specifying body strike for the Naudy model point dataset for details Resampling mode for data preparation Library Help Top The Naudy Automatic Model tool requires data points in the line dataset to be evenly distributed with no internal gaps When INTREPID loads a line dataset it immediately resamples if this is not the case INTREPID replaces nulls using the cubic spline linear or nearest neighbour interpolation method The default method is linear interpolation You can change the method using the Current Line Statistics and Options dialog box See Querying lines and setting resampling options for instructions 2012 Intrepid Geophysics 4 Back gt INTREPID User Manual Naudy Automatic Model interpretation T43 14 Library Help Top Library Help Top q Back gt The Naudy Automatic Model tool performs further resampling and interpolation of this prepared data using its own methods as necessary for its process You can select one of three resampling modes For two of these modes you need certain aliases as described below 2012 Intrepid Geophysics lt 4 Back gt INTREPID User Manual Naudy Automatic Model interpretation T43 15 Library Help Top lt 4 Back gt gt gt To select the resampling mode 1 Load a line dataset for modeling as described abo
66. ssign the range of colours to depths between 0 and the Finishing at Depth value specified here This is likely to be a smaller number than you use as a maximum for calculating the Naudy solutions Specify the Finishing at Depth value required then choose OK Model Parameters and Testing A Scan for Initial Solutions Starting Depth 80 00 m and Finishing at Depth 5900 00 m Depth below Sensor Restrict Max Absolute Susceptibilty to 9 1000 Sl B Resample the Solutions rejecting those with Anomaly Amplitude less than 1 0000 nT Anomaly Amplitude greater than 1000 0000 nT OR Similarity Coefficient greater than 3 00 C Create the Model assuming a Line Spacing of 290 00 m Opt Refine the Model tor up to 5 Inversion Iterations OK Cancel See The range of depth values in the legend below for further explanation 4 Choose Plan Window from the Options menu File tne Interpret Plan window INTREPID displays the Plan View window 5 Choose Change Mode to switch between the Depth Similarity or Trend colour displays as required Trend is only available if the Calculate Trends option is turned on in Model Parameters 6 When you have finished with the Plan View choose Close 2012 Intrepid Geophysics 4 Back gt INTREPID User Manual Naudy Automatic Model interpretation T43 24
67. t like 3D dykes described by HOT SPOT structural data for import into Geomodeller the geologists editing and modelling package Naudy Automatic Model performs the modelling on data from single selected traverse lines of magnetic surveys On each line profile the tool estimates the number position dip angle and depth to magnetic source You can choose body type as an initial model parameter of the model for example dyke step flat prism There are various options for estimating strike for the TMI case Historically the method assumed that the strike of any elongated body is oriented orthogonal to the traverse line A trend matching method can be used to estiamte the strike locally throughout the survey Once you have a Full magnetic tensor signal this is not a necessary step as the signal conatins enough local curvatures of the field to un ambiguously provide a strike direction for a 2D body 2012 Intrepid Geophysics 4 Back gt INTREPID User Manual Naudy Automatic Model interpretation T43 2 Library Help Top 4 Back gt Naudy Automatic Model concepts Library Help Top Body See definition of Inferred geological structure below Body strike Direction of an inferred geological structure when viewed from above Body dip The angle between the horizontal plane and the long axis of the inferred geological structure when viewed in a vertical section at right angles to Body strike Calcula
68. ted field The magnetic field that would result from inferred geological structures Clearance field The height of the measurement sensor above the ground surface This allows source depth estimates to be corrected for aircraft height above ground Depth increment factor dif INTREPID divides the depth range for calculating Naudy solutions into sections according to the depth increment factor The height of the next depth section is dif times that of the section above See Scanning for Naudy solutions Depth range The range of depths for finding and reporting Naudy solutions INTREPID will not calculate solutions outside this range Depth range section See definition of Depth increment factor above for an explanation Distance factor When resampling Naudy solutions INTREPID examines a region surrounding each solution If the region contains one or more other solutions INTREPID retains the solution with the lowest similarity coefficient and rejects the others The X and Depth distance factors determine the size of the region examined around each solution See Resampling the Naudy solutions Dyke See definition of Inferred geological structure below Forward modelling Calculating a model by manually setting parameters and examining the calculated results as opposed to inversion modelling which automatically adjusts the parameters so that the calculated result will closely match the observed data Geomodeller The sister prod
69. this diagram Detrend Raw and Filtered Line This check box does not apply to this tool Detrending of the input field is always on Overlay Filtered Line This check box does not apply to this tool Zoom both lines This check box does not operate in this tool All zoom operations synchronise both display areas 1 In the current version of INTREPID this statistic is available only if you are using geographic resampling If you require the corresponding statistic for chronological resampling contact our technical support service See Resampling mode for data preparation for further details Library Help Top 2012 Intrepid Geophysics 4 Back gt INTREPID User Manual Naudy Automatic Model interpretation T43 23 Library Help Top Plan view Library Help Top 4 Back gt You can display a plan view of the current model It shows all lines for which the model exists with the inferred geological structures superimposed on the lines gt gt To display the plan view 1 Ifyou will only be using Similarity colour mode where colours represent the similarity coefficient of the inferred geological structures go to step 4 2 Inspect the model for some lines to determine the range of depths of the inferred geological structures 3 Ifthe Model Parameters and Testing dialog box is not open choose Sensitivity Test Parameters from the Interpret menu to display it For Depth colour mode display INTREPID will a
70. to start depth x dif The height of the next depth section is dif times that of the section above Deeper sections therefore are larger than shallower ones INTREPID records the depth of a Naudy solution as the depth of the section to which it belongs Specifying constant body strike Advanced option You can specify a constant body strike for inferred geological structures that may result from the Naudy solutions The default body strike is perpendicular to the line direction For Naudy solutions used to calculate inferred geological structures INTREPID will save this data in the Naudy model point dataset as field Strike At the formal processing stage if you have regularly spaced lines and you select the Calculate Trends option then individual body strikes will be estimated using the trend data These strike estimates will be writtne to the Strike field See Specifying body strike for the Naudy model point dataset for details Use a fixed body strike of Use this to specify a fixed strike for inferred geological structures 0 represents North and positive values represent clockwise rotation e g 90 represents East Set bodies perpendicular to the line Use this check box to specify the strike for inferred geological structures as perpendicular to the line direction This will override any existing Fixed Body Strike setting Calculate Trends requires evenly spaced parallel lines Use this option to derive trends from you
71. uct Geomodeller has a specially tailored import facility to directly receive via a CSV file the output from this tool to rapidly help create a coherent 3D dyke swarm model The interface is designed to allow you to do repeated trials to best extract those geology bodies you wish to further interpret in the context of creating a more holistic geology model HOT SPOT Each solution for a 2D body along a profile can be thought of as an intersection between the induced response from a geological body as observed from an airborne sensor The step of then collecting and sorting all the individual solutions into a set of coherent and consistent observation of a set of dykes is sometimes called Worming Inferred geological structure After calculating Naudy solutions for a line INTREPID can infer the size and position of geological structures likely to cause the observed magnetic field Interpolation method When preparing line data for the Naudy Automatic Model INTREPID resamples it so that the data points are evenly spaced along the line This involves interpolating between existing data points You can select the interpolation method See Querying lines and setting resampling options Inversion process Inversion modelling See the definition of Refining inferred 2012 Intrepid Geophysics 4 Back gt INTREPID User Manual Naudy Automatic Model interpretation T43 3 Library Help Top Library Help Top lt 4 Bac
72. utput Naudy model point dataset to save your results using Save Model As from the File menu This behaviour is new in Intrepid V4 2 2 In earlier versions the model results file was specified at the start of modelling operations Or It is no longer possible to load an existing Naudy model point dataset which you wish to view extend or modify in INTREPID V4 2 2 It is available again in V5 0 File gt Specify Report Before proceeding with a modelling session it is recommended that the user specify a report file name for saving the progressive results of a session Naudy uses a default file name and this will is appended to from session to session making it difficult to track results and settings at a later time File gt Export Dykes to Geomodeller You must have saved the model first Options are presented to allow you to select and influence the number length sampling frequency etc of a what amounts to a geophysics derived set of strucural geology observations of any dykes present in the survey Note During the Naudy Automatic Model session you can at any time View line statistics Change line resampling options Zoom the display in and out and Display different line profiles View gt Plan Window Display the current Naudy model in a plan view window 2012 Intrepid Geophysics 4 Back gt INTREPID User Manual Naudy Automatic Model interpretation T43 9 Library Help Top lt 4 Back gt See Navigating the pr
73. ve Right click in the upper profile panel and INTREPID displays the Resampling Mode dialog box Line 14100 Signal Field microlevelled Bearing 271 Line Statistics No of Samples 1764 No of Interpolated Samples 1764 Field Minimum Maximum Mean StdDev Nulls 64 8826 78331192 148 180776829799 3 986185338353 46 014444 0 Nyquist Frequency 82 3956 cycles km Sample Spacing C Use Fixed Spacing 0 00606828492 km Use Average Spacing 0 00606828492 km Minimum Sample Spacing 0 00540403956 km Maximum Sample Spacing 0 00654133716 km Interpolation Method Linear C Cubic Spline C Nearest Neighbour Detrend Method C DC shift Use line ends C Least square fit Average Line Direction North to top Display Options Number of points to take into account at line ends for line end detrending V Detrend Raw and Filtered Line M Overlay Filtered line M Zoom Both Lines OK Cancel 2 Select the resampling mode Linear Cubic Spline Nearest Neighbour by toggling the required option 3 Geographic Geo Located INTREPID examines the X and Y fields of the dataset and resamples the data so that it is distributed evenly with respect to distance If you choose this option your line dataset must have properly defined X and Y aliases Use Fixed Spacing Use this text box to specify the resampling interval in kms Use Average Spacing Default Use this text box to use the average sampling interval in kms Library

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