|
<< Click to Display Table of Contents >> Navigation: Statics > Apply azimuthal static shifts |
Applies azimuthal refraction static corrections to prestack seismic gathers. Each trace receives an individual time shift derived from a precomputed azimuthal statics correction item. The shifts are applied using high-quality 8-point sinc interpolation to preserve wavelet shape while correcting for near-surface velocity variations that depend on the source-receiver azimuth. A static curve overlay in the gather viewer shows the applied shift per trace in real time for quality control.
Place this module after the azimuthal refraction statics solver has produced a correction item, and before NMO correction or azimuthal velocity analysis. It is the application step in the azimuthal refraction statics workflow.
The survey geometry and trace database providing header information (source, receiver, and bin identifiers) used to look up the correct azimuthal static shift for each trace.
The prestack seismic gather to correct. This can be a CMP, common-offset, or common-azimuth gather. Trace headers must carry full geometry information including source and receiver positions so that the azimuthal static shift can be retrieved from the correction table.
The azimuthal refraction statics correction item produced by the upstream statics solver. This item stores the per-trace time shift indexed by source-receiver azimuth and location. Connect the output of the azimuthal refraction statics estimation module here. The item must be fully computed before execution begins.
A QC gate (ms) that protects the gather from outlier corrections. Any trace whose computed azimuthal static shift is equal to or greater than this value in absolute magnitude is left unshifted. Default: 0 ms (disabled — all shifts are applied). Set a positive value (for example, 50–200 ms) to suppress corrections caused by noisy first-break picks or bad traces in the statics solution.
When enabled, writes the applied time shift back into the trace static header field. Default: No. Enable this option if you need the applied shift values to be available for downstream processing or for export to SEG-Y output files.
Controls the sign of the applied correction. Forward (default) — shifts traces upward in time to remove the near-surface azimuthal delay. Reverse — applies the opposite-sign correction, adding the delay back. Use Reverse to undo a previously applied forward correction.