Abstract: Eugene Island Block 330 Field Offshore Louisiana

By

David S. Holland

The Eugene Island Block 330 Field is currently the largest oil producing field on the Federal Outer Continental Shelf of the United States. The field, located about 150 miles southwest of New Orleans, Louisiana, was discovered by the Pennzoil No. 1, OCS G-2115 in March, 1971, following leasing on December 15, 1970. The field includes Blocks 313, 314, 315, 330, 331, 332, 337, and 338, Eugene Island Area, South Addition, Offshore Louisiana.

The field is an anticlinal structure on the downthrown side of a large northwest trending growth fault. Production is from more than 20 Plio-Pleistocene delta front sandstone reservoirs ranging in age from Lenticulina to Trimosina "A" and located at depths of 4,300 to 12,000 feet. Reservoir sand thickness ranges from 20 to 90 feet. The reservoir energy results from a combination water drive and gas expansion system. Recoverable reserves are estimated to be greater than 225 million barrels of liquid hydrocarbons and 750 billion cubic feet of gas.

Considerable subsurface data provided by 220 exploration and development wells and several seismic grids from the basis for the interpretation of the geology, geophysics and petrophysics of the Block 330 Field and its producing horizons.

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