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Edison Oil Field
The Edison Oil Field is a large oil field in Kern County, California, in the United States, in the southeastern part of the San Joaquin Valley and adjacent foothills east-southeast of Bakersfield. The field has a total productive area of over , most of which is intermingled with agricultural land uses; oil pumps and storage tanks are surrounded with row crops and orchards in much of the field's extent. Discovered in 1928, and with a cumulative production of of oil as of 2008, and having over 6 million in reserve, it is ranked 38th among California's oil fields by total ultimate recovery.〔 p. 63.〕 It is a mature field in decline, and is run entirely by small independent operators. As of 2008, there were 40 different oil companies active on the field, one of the most in the state for a single field.〔DOGGR (2008), p. 112-168〕 914 wells remained active on the field, averaging only two barrels of oil per well per day from the dwindling reservoirs.〔DOGGR (2009), p 89〕
==Setting==
The field lies in the flat bottomlands of the lower San Joaquin Valley, east-southeast of Bakersfield just outside of the outlying residential areas. A small portion of the field – the Racetrack Hill area – extends into the lower foothills of the Sierra Nevada. The active portion of the field is approximately long north to south by across, with the most productive portions to the east and northeast.〔DOGGR, p. 146〕 California State Route 58 crosses the field east to west, and California State Route 184, the Weed Patch Highway, runs north to south through the western part of the oil field.
Terrain in the vicinity of the oil field varies from almost table-flat, in the valley bottomlands, to rolling hills in the northeast, with elevations ranging from approximately above sea level throughout the productive region. The land rises with a slight gradient to the east and northeast, in the direction of the foothills of the southernmost Sierra Nevada. Climate is typical of the southern San Joaquin Valley, and is arid. Temperatures in the summer routinely exceed on cloudless days. Rain falls mainly in the winter months, and averages annually. Freezes occur occasionally during the winter, and the winter months are also subject to frequent dense tule fogs, limiting visibility to near zero. Drainage from the field in generally into the irrigation canal system, but because of the flat surface gradient most rainfall soaks directly into the ground.〔(Ecoregion description )〕 The air quality in the vicinity of the field, as recorded in the town of Arvin to the west, is among the worst in the United States.〔Thanawala, Sudhin. "Calif. Town Is Nation's Smoggiest", Associated Press. ()〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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