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1、Preliminary InterpretationObjectives Generate attribute cubes Introduction to Ant-tracking Generate the Structural Smoothing attribute cube Generate Chaos attribute cube as input for Ant-tracking cube Generate the Ant-tracking cube Automatic Fault Extraction Settings for fault patches Edit Extracted
2、 Faults Convert fault patches to fault interpretation Volume Extraction Train Estimation Model - Neural netsGenerate attribute cubes55.Display an Inline and a Crossline to quality check the result before realizing the attribute cube2.Choose desired attribute from the library23.Select the Input seism
3、ic, specify the output name (or leave it unselected it is given a default name)34.Tick on virtual, then Apply41.RMB the seismic volume and go to Volume attributes, or open from Processes pane1How to do the Ant-tracking WorkflowOriginal seismic data can be conditioned using structural smoothing with
4、the fault edge preservation option.A Variance or Chaos cube needs to be generated to be used as input to the Ant-tracking process. Any other input that enhances discontinuities can be used (e.g. Coherency). Needs to be imported through SEG-Y loader or Open-Spirit connectivity.Ant-tracking generates
5、an enhanced Ant cube. Extracted fault patches can be generated from the Ant-cube and will be saved in a separate folder.Typically the interpreter will work with a sub-set of the data and fine tune parameters before applying to the entire area of interestAnt-tracking Generate attribute volumes for an
6、t-tracking5.Display an Inline or a Crossline to quality check the result before realizing the attribute cube52.Choose the Structural smoothing attribute under Structural methods23.Select the Input seismic, specify the output name and toggle on the Dip-guide and Enhance edge34.Toggle on Virtual and A
7、pply41.RMB click on the seismic realized cube and go to Volume attributes 1Ant-tracking Generate attribute volumes for ant-tracking1.Right click on the attribute cube (Structural smoothing) and go to Volume attributes 12.Choose the Chaos attribute under Stratigraphic methods23.Check the Input seismi
8、c and specify the output name Toggle on Virtual and Apply34.Display an Inline and a Crossline to quality check the result4Note: Ant-tracking attribute cubes can only be made as realized volumes. It is a CPU-intensive process. Test parameters on a small cube before calculating the entire volume of in
9、terestGenerate the Ant-tracking cube1.Right click on the attribute cube (Chaos) and go to Volume attributes 12.Choose the AntTracking under Structural methods23.Select Passive or Aggressive Ants and check the Ant-tracking setting options4.Use stereonet tab to limit direction and dips for ants search
10、 criteria (grey areas) if needed5.Click Apply34The Ant-tracking attribute cube will be put in the Input tab5Ant-tracking parameters2D example of ants path through voxels- Discontinuity- Initial ant agents- Tracking Ant agent- Step advance distance- Illegal step distance- Tracking direction- Distance
11、 to search off track directionSearch until discontinuity is found or exceed step distance plus illegal step distanceSearch for next discontinuity (when found it defines direction of travel) Search for next discontinuity in tracking direction within defined distance of that directionRepeat until no d
12、iscontinuity is found. Start next antIf ant encounters an existing track within proper orientation range then it follows that to its endLegal Step parameter defines how many legal step advances must be taken after an illegal step and before another illegal step is taken.Ant-tracking Automatic fault
13、extraction process1.Activate the Automatic fault extraction process under Geophysics in the Processes pane2.Double click on the process, go to the Info tab to get general information3.New function bar available for the Automatic Fault Extraction process12Open Automatic fault extraction dialogStereon
14、et settingsHistogram settingsToggle nearest patchHide selected patchesShow hiden patchesMerge selected patchesSmooth selected patchesConvert to fault interpretationConvert to fault in fault modelUndo operation (one level)Delete selected patchesSeeded 3D fault autotracking3Automatic fault extraction1
15、.In the Automatic fault extraction process, go to the Extract fault patches tab2.Left click and drop in the Ant-tracking cube in the dialog box3.Set Fault extraction parameters and click Extract fault patches4.Fault patches are put in the Input pane123422.Go to the Histogram tab and filter on the Fa
16、ult Patch surface area. Click on the histogram representing the small areas and click ApplySettings for Fault patches Histogram filtering1.Right click on the fault patches object and open Settings 13.The small faults will be hidden311.Go to the Stereonet tab and filter on the fault patch dip and azi
17、muthSettings for Fault patches Stereonet filteringSelecting a fault patch with Select/pick mode in a 3D window (gray patch) marks it as a red dot in the Stereonet2.Faults with dip and azimuth falling in the grey area in the Stereonet are not displayed2Interactively hide Fault patches1.Make sure the
18、Automatic fault extraction process is activated133.Click on the ”Hide selected patches” icon and the selected fault patches are hidden2.A set of tools will be available in the Function bar. Activate the ”Set select/pick mode” icon and select fault patches to edit2Semi-automatic Fault Patch interpret
19、ation33.Repeat until fault is fully interpreted 1.Set looser Extract fault patches parameters2512.Activate the ”Seeded 3D fault autotracking” icon and manually set a seed point on an Ant cube line5.Click on ”Merge selected patches” icon4.Select patches ( and Shift + ) describing the fault42.Select t
20、he patch and click on the Smooth icon 2Smooth Fault patches1.Open Settings tab for the Automatic fault extraction process, keep default parametersNote: Patches cannot be edited, only smoothed and merged. Edit patch after converting to fault interpretation or fault model. 1433.Undo the latest smooth
21、if not satisfied4.Set the Control of Fault Patch Smoothing slider to a stronger smoothing. Apply and Smooth again2Convert fault patches to interpretation or Modeled faults135.Spacing and height of the modeled faults and fault sticks are controlled from the process Setting tab41.To show hidden patche
22、s click on the ”Show hidden patches” icon2.Activate ”Select/pick mode” to select fault patches for conversion3.Click on the ”Convert selected to fault interpretation” icon. The fault interpretation is put under an Interpretation folder in the Input pane4.Click on the ”Convert selected to fault in fa
23、ult model” icon. The modeled faults are put in the Models pane of Petrel Explorer5Quality control the automatic generated faults1.Quality check the faults against seismic and attributes. 2.Step through the volumes using the player3.Edit/delete the points that are not correct1231.Activate a 3D window
24、. Display an inline and a crossline 2.In the Process pane, open the Geophysics process and activate Volume Extraction3.Use Extract Single Object by Planting a Seed . Identify a strong event, click on the edge of the signalVolume extraction Single object14.Open Settings for the extracted object. Togg
25、le on Grid under the Styles tab234Volume extraction All isosurfaces1.Use the activate 3D window with an inline and a crossline displayed2.Use Create All Isosurfaces in Cropped Volume . Type in the amplitude value and OK3.Open settings for extracted object. Go to Operations tab. Set Minimum number of
26、 triangles. Click Filter4.Under the Style tab, change Solid Color to Different (for each body)4231Train estimation model - Neural nets 1.Generate one or more Attribute cubes from the same seismic volume. Make all volumes virtual2.Open the Train Estimation Model process found under Utilities3.Use Cre
27、ate new model and Classification. From the drop down menu under Data type, select Seismic4.Drop in the “Mother” seismic volume in the Seismic drop in area and select volumes to be used5.Set a selection of Training data6.Click on the Corr Analysis to calculate correlation coefficients between the inp
28、ut volumes123546Train estimation model - Neural nets 7.Open the Settings tab and specify number of classes under Unsupervised8.Set Training parameters or leave the defaults9.Under Output tab, Create new or Update existing if available. Apply to generate the new volume10.Display inlines and crosslines from the newly created Classified volume98710EXERCISE Preliminary Interpretation
