Amplitude changes with offset evident in subsalt data
- Diamond Geoscience Research Corp., Tulsa, OK (United States)
- Diamond Geoscience Research Corp., Houston, TX (United States)
The ability to detect amplitude changes associated with offset in seismic data reflected through subsurface salt bodies raises an intriguing question for geophysicists: Is amplitude variation with offset (AVO) interpretation possible for subsalt sediments? It is too soon to claim that 3D AVO technology can be used to detect subsalt hydrocarbon accumulations. What can be said is that modern seismic methods are resolving the velocity problems created by the presence of salt to such an extent that amplitude changes related to offset are apparent in subsalt reflections. What is not yet known is whether the changes result from the presence of hydrocarbons, changes in rock properties, raypath distortion, or something else. An important lesson is becoming clear, however: Discrete parts of the seismic cable contain vital information that can be lost when interpretation is confined to the full-volume stack. The paper discusses AVO effects, near and far offsets, salt and wave fronts, pore pressure prediction, frequency analysis, and information needs.
- OSTI ID:
- 428201
- Journal Information:
- Oil and Gas Journal, Journal Name: Oil and Gas Journal Journal Issue: 44 Vol. 94; ISSN 0030-1388; ISSN OIGJAV
- Country of Publication:
- United States
- Language:
- English
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