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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 nets,Generate attribute cubes,How to do the Ant-tracking Workflow,Original seismic data can be conditioned using structural smoothing with the fault edge preservation option.A Variance or Chaos cube
3、 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 an enhanced Ant cube.Extracted fault patches can be generated f
4、rom 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 interest,Ant-tracking Generate attribute volumes for ant-tracking,Ant-tracking Generate attribute volumes for ant-tra
5、cking,Note: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 interest,Generate the Ant-tracking cube,4,The Ant-tracking attribute cube will be put in the Input tab,5,Ant-tracking par
6、ameters,2D example of ants path through voxels,-Discontinuity,-Initial ant agents,-Tracking Ant agent,-Step advance distance,-Illegal step distance,-Tracking direction,-Distance to search off track direction,Search until discontinuity is found or exceed step distance plus illegal step distanceSearch
7、 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 discontinuity is found.Start next antIf ant encounters an existing track within proper orientation range then it follows that
8、 to its end,Legal 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 extraction process,Activate the Automatic fault extraction process under Geophysics in the Processes paneDouble click on th
9、e process,go to the Info tab to get general informationNew function bar available for the Automatic Fault Extraction process,1,2,Automatic fault extraction,In the Automatic fault extraction process,go to the Extract fault patches tabLeft click and drop in the Ant-tracking cube in the dialog boxSet F
10、ault extraction parameters and click Extract fault patchesFault patches are put in the Input pane,1,2,4,Settings for Fault patches Histogram filtering,Settings for Fault patches Stereonet filtering,Selecting a fault patch with Select/pick mode in a 3D window(gray patch)marks it as a red dot in the S
11、tereonet,Interactively hide Fault patches,Semi-automatic Fault Patch interpretation,3,Repeat until fault is fully interpreted,Set looser Extract fault patches parameters,2,5,1,Activate the”Seeded 3D fault autotracking”icon and manually set a seed point on an Ant cube line,Click on”Merge selected pat
12、ches”icon,Select the patch and click on the Smooth icon,2,Smooth Fault patches,Open Settings tab for the Automatic fault extraction process,keep default parameters,Note:Patches cannot be edited,only smoothed and merged.Edit patch after converting to fault interpretation or fault model.,1,4,3,Undo th
13、e latest smooth if not satisfied,Set the Control of Fault Patch Smoothing slider to a stronger smoothing.Apply and Smooth again,2,Convert fault patches to interpretation or Modeled faults,1,3,Spacing and height of the modeled faults and fault sticks are controlled from the process Setting tab,4,To s
14、how hidden patches click on the”Show hidden patches”iconActivate”Select/pick mode”to select fault patches for conversionClick on the”Convert selected to fault interpretation”icon.The fault interpretation is put under an Interpretation folder in the Input paneClick on the”Convert selected to fault in
15、 fault model”icon.The modeled faults are put in the Models pane of Petrel Explorer,Quality control the automatic generated faults,Quality check the faults against seismic and attributes.Step through the volumes using the playerEdit/delete the points that are not correct,1,2,3,Activate a 3D window.Di
16、splay an inline and a crossline In the Process pane,open the Geophysics process and activate Volume ExtractionUse Extract Single Object by Planting a Seed.Identify a strong event,click on the edge of the signal,Volume extraction Single object,1,Open Settings for the extracted object.Toggle on Grid u
17、nder the Styles tab,2,3,4,Volume extraction All isosurfaces,Use the activate 3D window with an inline and a crossline displayedUse Create All Isosurfaces in Cropped Volume.Type in the amplitude value and OKOpen settings for extracted object.Go to Operations tab.Set Minimum number of triangles.Click
18、FilterUnder the Style tab,change Solid Color to Different(for each body),4,2,3,1,Train estimation model-Neural nets,Generate one or more Attribute cubes from the same seismic volume.Make all volumes virtualOpen the Train Estimation Model process found under UtilitiesUse Create new model and Classifi
19、cation.From the drop down menu under Data type,select SeismicDrop in the“Mother”seismic volume in the Seismic drop in area and select volumes to be usedSet a selection of Training dataClick on the Corr Analysis to calculate correlation coefficients between the input volumes,1,6,Train estimation mode
20、l-Neural nets,Open the Settings tab and specify number of classes under UnsupervisedSet Training parameters or leave the defaultsUnder Output tab,Create new or Update existing if available.Apply to generate the new volumeDisplay inlines and crosslines from the newly created Classified volume,9,10,EXERCISE Preliminary Interpretation,
