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3D In-line/Cross-Line Import

In the 3D In-line/Cross-Line Import method, the Import Wizard reads the in-line/cross-lines from the trace headers and determines the number of in-lines/cross-lines in your 3D dataset and how they should be labelled. You must provide the x/y coordinates for three in-line/cross-line locations.

• SEG-Y traces in your file are assumed to be sorted in the in-line direction.

Follow these steps:

1. Select <3D In-line, Cross-Line Import> from the Select Coordinate Import window if your in-line and cross-lines are in the trace header, but your x/y coordinates are not. View image

2. >Once you select this option, the <Leave Dead Traces> button will appear in the window. Dead traces are assumed to have incorrect trace headers, so WinPICS interpolates x/y’s for the dead traces. Click on this button to drop dead traces and the button will read <Drop Dead Traces>. Dropped dead traces will not be displayed on your seismic, but are not removed from your SEG-Y file. If you plan to import additional processing versions, do not drop dead traces.
3. Click <Next> at the bottom of the Select Coordinate Import window. A new window will open. View image

4. Edit the labeling for the in-lines and cross-lines under Labeling In-line/X-line, if necessary. These values were read from the trace headers in your file. If the file has been decimated, enter an In-line Step. The End In-line is automatically updated.
5. Enter the x/y coordinates for two in-line/cross-line locations on a single in-line under Defining Two Points on the SameIn-line. This provides the in-line bin size of your file. Use the º key to move between boxes.
6. Enter the x/y coordinates for a third point that is on the same cross-line as the first or second point under Defining Point Perpendicular to Above In-line. This provides the cross-line bin size and geometry of the 3D data area.
7. Set Advanced 3D Import Options, as appropriate.
8. Toggle the Convert Coords option if you need to modify the coordinates projection.
9. Click the <Process 3D Coordinate Import> button. A dialog box will open summarizing the in-line and cross-line bin size and the angle between in-lines and cross-lines. Click <OK> if these are correct.
10. Click <Preview Map> to see the coordinate locations of your 3D data area on your project map.
11. Click on <Next> to proceed to the Line Intersections and Seismic Import Properties dialog box.
12. The Total Number of In-line/X-line in SEG-Y File section displays the number of in-lines and cross-lines that the wizard found in your file. If these numbers are incorrect, it is very likely that there is a problem with the in-line and cross-line numbering in your file.

What do you want to do?

• Select your coordinate import options