Wilmington Oil Field The Wilmington Oil Field is a prolific petroleum field in Los Angeles County in southern California in the United States. Discovered in 1932, it is the third largest oil field in the United States in terms of cumulative oil production . The field runs roughly southeast to northwest through the Los Angeles Basin , stretching from the middle of San Pedro Bay through Long Beach and east of the Palos Verdes Peninsula . The field originally contained approximately at least some of reserves. In 2013, the USGS estimated future potential production from the combined Wilmington-Belmont oilfield could be around. The offshore portion of the oil field is developed largely through wells drilled directionally from THUMS Islands , four artificial islands in Long Beach Harbor .Operations currently operates the Wilmington Oil Field in partnership with the State of California and the City of Long Beach . CRC's Long Beach operations include:THUMS Long Beach Company , which operates the offshore portion of the Wilmington Oil FieldTidelands Oil Production Company , which operates the onshore portion of the Wilmington Oil Fieldtwo additional smaller leases in the Long Beach areaData Estimations as of 2013. cumulative production: estimated reserves: annual production: producing wells: 1,428 estimated year of depletion : 2031 A 2013 USGS report estimates that the Wilmington-Belmont oilfield had Original oil-in-place of between of oil, of which an additional could be produced, with their best estimate of future production potential.Geology The field was discovered with the Ranger Petroleum Corp.'s Watson No. 2 well in 1932, which flowed at 150 bbl per day, and the broad anticline structure itself was discovered in 1936 by the General Petroleum Corp.'s Terminal No. 1 well based on a Reflection seismology survey. An offshore seismic survey in 1954 showed the field extended some miles to the southeast. The anticline plunges to the northwest and is separated from the Torrance Oil Field by a saddle, and is similarly separated from the Huntington Beach Oil Field to the southeast. A series of transform faults divides the field into separate blocks which form barriers to fluid movement and pressure changes. Basement consists of the Catalina Schist and is overlain with up to 8,000 feet of Miocene and Pliocene sediments, the main oil producing zones being the Puente and Repetto sandstones . An unconformity in the Pliocene between the Repetto and the Pico indicates the top of the structure was eroded to a flat surface and later Pliocene and Holocene sediments were deposited horizontally.Withdrawal of large volumes of oil from the poorly consolidated sediments resulted in compaction of the oil reservoirs, and resultant sinking of the overlying land surface . Subsidence became apparent in 1940, and exceeded 20 feet at the center . Water injection to maintain pressure in the oil reservoirs began in 1953, which eventually stopped further subsidence.
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