AVO (Amplitude-vs-Offset) is a seismic technique which examines how reflection events change with varying angles of incidence of the seismic waves. This change is related to elastic properties of the reflecting formation, which may be associated with particular fluid saturation and lithology conditions.

In this paper, a data set composed of well logs and a coinciding surface seismic line are used to evaluate the AVO technique for a major Gulf carbonate reservoir. From the logs, Poisson's ratios were calculated and combined with a log-based stratigraphic model to estimate the AVO response of the reservoir formations. Specifically, the amplitude gradient curve for a zero phase response with increasing angle was calculated. The surface seismic data was processed for a comparable AVO result. Combined interpretation of the two indicates possible changes in the oil reservoir across a structure. One conclusion is that AVO interpretation without reference to valid physical models is very difficult.

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