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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 mi (240 km) southwest of New Orleans, Louisiana, was discovered by the Pennzoil 1 OCS G-2115 well 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 Pliocene-Pleistocene delta-front sandstone reservoirs ranging from Lenticulina to Trimosina "A" zones and located at depths of 4,300 to 12,000 ft (1,290 to 3,600 m). Reservoir sandstone thickness ranges from 20 to 90 ft (6 to 27 m). The reservoir energy results from a combination water-drive and gas-expansion system. Recoverable reserves are estimated to be greater than 225 million bbl of liquid hydrocarbons and 750 Bcf of gas.
Considerable subsurface data provided by 220 exploration and development wells and several seismic grids form the basis for our interpretation of the geology, geophysics, and petrophysics of the Block 330 field and its producing zones.
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