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It is always recommended to scan the SEG-Y file before import, to make sure the settings for each trace attribute are correct. Click the Scan button and observed the results in the Scan Results tab.
Example of scan results
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Shot point byte position
If the Min and Max values for Shot point looks odd, the byte position could be wrong. The default shot point byte position in the SEG-Y 2D import is 17-20 in the trace header, but in some cases this is not always correct. If the byte position is wrong try the following:
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Use the Shot point, Byte pos. spinbox to set the appropriate byte position.
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Coordinates and scaler
Make sure the X coordinate has 6 digits and that the Y coordinate has 7 digits. In some cases the scaler may be wrong, causing the X and Y values to have to few or to many digits. This can be adjusted by changing the scaler multiplication factor.
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| Note |
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The scaler may be 0 on file. This will lead to X and Y being 0 in the dataset. Fixing the Scaler to 1 is usually the correct setting in this case. |
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Z(twt)-range and sample interval
The Z values are usually correct but you can have a look in the EBCIDIC header to see if there is any information about the sample interval or Z-range.
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