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Bulk Shift With Diagnostics

If you opened the Bulk Shift function from a fence display you will see a normalized cross-correlation plot of the active seismic line with the reference seismic line in the time domain.

The blue curve is the normalized cross-correlation function. The red curve is the envelope amplitude of the cross-correlation function. If two seismic lines are perfectly tied, the largest peaks of the cross-correlation and envelope plots will be positive and symmetrical about zero time.

Using the Bulk Shift Diagnostics

Follow these steps:

1. Define your area of interest by specifying a start and end time under Time Window or move the grey bar on your seismic to bracket your time range.
2. Select which Reference Line you want to use.
3. Enter the number of traces to use in the cross-correlation analysis under Average Traces.
4. Apply a bulk shift to center the largest peak of the envelope about zero time. The seismic is updated dynamically. You can also click on the <Bulk Diff> correction button in the lower right-hand corner of the window. This is an estimate of the bulk shift difference between the seismic lines.
5. If you are unable to make the cross-correlation curve symmetrical about zero time, see Tie with Diagnostics to adjust phase, amplitude, polarity, and band-pass filters.
6. Click <OK> to apply the bulk shift correction or click <Cancel> to exit without applying changes.

What do you want to do?

• Get an overview of how to apply bulk shifts to your seismic
• Change axis values or to enable cursor tracking on the cross-correlation plot
• Use diagnostics to tie lines
• Apply phase corrections to your seismic