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Bay Marchand Field, a giant Gulf of Mexico oil field discovered in 1949, is undergoing renewed drilling activity as the result of a recently acquired 3-D seismic survey. The field, situated over a large salt diapir, is characterized by complex fault systems and typical Gulf Coast regressive sedimentation. As of 1989, over 700 wells had produced 518 MMBO and 379 BCFG from the field. The 3-D survey, which took nearly two years to plan, shoot, and process, covers over 60 square miles (Fig. 1). It was shot for the following objectives:

  1. (1)

    delineate new pools;

  2. (1)

    review mature, drilled areas for additional opportunities;

  3. (1)

    assist reservoir management primarily in the form of secondary recovery.

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