A dip-dependent divergence correction
- Colorado School of Mines, Golden, CO (United States)
A divergence correction is conventionally applied to zero-offset data in an effort to preserved amplitude information. The conventional divergence correction compensates for the geometrical spreading of a point source in a horizontally layered medium where velocity varies with depth only. The dip-dependent divergence correction extends the conventional correction for improved amplitude processing of dipping beds. The dip-dependent divergence correction is computed by dynamic ray tracing, and applied to stacked data using a dip decomposition technique. This correction decreases amplitudes relative to the conventional correction for steep dips and late times. In a data example from the Gulf of Mexico, the conventional correction over- amplified the reflection off a salt dome flank by a factor of 1.6. High amplitudes near salt flanks are also associated with the presence of hydrocarbons. Applying the dip-dependent divergence correction ensures that ``bright spots`` are not due to over-amplification of steep dips by the conventional correction. In areas like the Gulf of Mexico, where the velocity function varies primarily with depth, and steep beds are commonplace, the dip-dependent divergence correction is an inexpensive way to improve the amplitude information in seismic images.
- Research Organization:
- Colorado School of Mines, Golden, CO (United States). Center for Wave Phenomena
- Sponsoring Organization:
- USDOE,
- DOE Contract Number:
- FG02-89ER14079
- OSTI ID:
- 10159095
- Report Number(s):
- DOE/ER/14079--15; CWP--116; ON: DE92016283
- Country of Publication:
- United States
- Language:
- English
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