Amplitude-versus-offset (AVO) analysis has had a dramatic impact on exploration in the Texas Gulf Coast. It has opened new trends in mature areas as well as lowering drilling risk, so that even some small one-well targets are more economically attractive. From 1987–91, an estimated 300 billion ft 3 gas were found in the Eocene Yegua and Cook Mountain trends in stratigraphic traps by using AVO analysis (see Seismic hydrocarbon indicators lower risks by O. Welper et al., Oil & Gas Journal, November 4, 1991).

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