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3-D seismic detection of undrilled prospective areas in a mature province, South Marsh Island, Gulf of Mexico MICHAEL V. DEANGELO and LESLI J. WOOD, Bureau of Economic Geology, Austin, Texas, U.S. This paper focuses on the most effective approach to defining additional resources using 3-D seismic as the sole data source. Although this example is from a densely drilled province, such a seismic-based approach is often used in frontier areas with sparse well coverage, in step-out regions around known production, can be used for a “quick look” evaluation of existing properties, and for real-time interpretation of newly acquired data.