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The Mississippi Canyon Block 109 field, which is located approximately 18 miles offshore from the Mississippi Delta in water depth of 950-1100 feet, was discovered in 1984 and declared commercial by BP Exploration in 1989. The field consists of middle and upper Pliocene reservoir sands, with oil accumulations in both structural-stradgraphic and entirely stratigraphic traps. A 3D seismic survey, acquired and processed in late 1984-1985 and reprocessed in 1987, has been and continues to be instrumental in the development of this field.

The 3D survey was acquired after drilling of the MC 109 #1 discovery well in 1984 and was first used to resolve the complex structure of the field. Integration of the results of initial drilling with this structural interpretation strongly suggested that there was a significant stratigraphic component to entrapment of hydrocarbons in the field. In conjunction with a revised depositional model for the reservoir sands, a new interpretation of the reprocessed 3D survey was used to identify these reservoirs and describe them in terms of reflection character and amplitude. The new interpretation was confirmed by the successful drilling of the MC 109 #3 and #3 ST wells in 1988, after which Block 109 was transferred to production for additional detailed work and assessment of development potential. The MC 109 #4 and #4 ST wells were subsequently drilled to confirm hydrocarbon pays in an untested fault block, and the MC 109 #5 well was drilled to obtain information bn fluid properties and additional geological data needed for field development plans.

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