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Bulk Shift - Overview

Apply bulk shifts to individual seismic lines or to a seismic line within a fence display. Line tie diagnostics (cross-correlation and spectral analysis) are available if you open the bulk shift function from a fence display. View image

Using the Bulk Shift Function

Follow these steps:

1. Right-click on the seismic line you wish to bulk shift and select Bulk Shift or Tie with Diagnostics from the shortcut menu (or press <t> on your keyboard). The bulk shift function allows you to simply apply a bulk shift to the seismic, while the tie with diagnostics function allows you to apply phase, amplitude, polarity, and band-pass filter adjustments in the same window as the bulk shift adjustments. In order to use the bulk shift with diagnostics function (cross-correlation analysis), you must open the Bulk Shift or Tie with Diagnostics function from a seismic line within a fence display.
2. Slide the slider bars up and down to apply a bulk shift. The seismic display will update dynamically.
3. Click <OK> to apply changes and exit window or click <Cancel> to exit without applying changes.

• When you display a line that has a bulk shift, the magnitude of the shift is displayed on the status bar at the bottom of the WinPICS seismic window. It will look like this: Bulk : 20 ms, where 20 ms is the bulk shift. No changes are made to your data file. A bulk shift is stored in the header file and is applied to traces and picks for display, plotting, and export.

What do you want to do?

• Use diagnostics to tie lines
• Create a fence
• Get an overview of line-tie functions
• Apply bandpass filtering
• Apply amplitude scaling
• Apply a phase rotation
• Apply polarity reversal
• Learn how to integrate line-ties with your horizon picks