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Guijarral Hills Oil Field
The Guijarral Hills Oil Field is a formerly-productive oil and gas field near Coalinga on the western side of the Central Valley in central California in the United States. Discovered in 1948, and having produced of oil during its peak year in 1950, it now has but one active oil well producing a little over a barrel of oil a day, and is very near to exhaustion, with only 343,000 recoverable barrels of oil remaining throughout its extent according to the official California State Department of Conservation estimate.〔 p. 101-2.〕 As of 2010, the only active operator was Longview Production Company.
==Setting==
The Guijarral Hills are a low range of hills, rising a little more than a hundred feet above the floor of the San Joaquin Valley to the east, and scarcely noticeable in the shadow of the nearby Coast Range of central California. These low hills are the surface expression of the southern portion of the Coalinga Anticline, which separates the smaller, largely agricultural Pleasant Valley to the west from the main portion of the California Central Valley to the east. The town of Coalinga is about eight miles (13 km) west of the hills, with the large Coalinga Oil Field wrapping around the town in a crescent shape. The Guijarral field is a similar, smaller, and separate field southeast of the giant Coalinga field.〔Hunter, G.W. ''Guijarral Hills Oil Field: California Division of Oil and Gas, Summary of Operations''. 1951. Vol. 37 No. 1. pp. 13-19.〕
The major road through the field is Jayne Avenue, which runs east to west, connecting Interstate 5 to Coalinga. California State Route 33 runs from north to south, west of the field, joining with Jayne Avenue. The Pleasant Valley State Prison, also on Jayne Avenue, is adjacent to the oil field on the west.
Climate in the area is arid to semi-arid, and native vegetation consists of grassland and low scrub. Summertime temperatures routinely exceed , and freezes occur during the coldest months, although snow is rare. Most precipitation occurs in the winter. Runoff to the west and north is into Los Gatos Creek, which flows northeast into the San Joaquin Valley; runoff to the south and east is into Zapato Chino Creek, which joins with Los Gatos Creek draining to the northeast. Elevations in the vicinity range from around in Los Gatos Creek north of the hills to at the highest point in the hills; the productive portion of the oil field ranges from around 550 to above sea level.〔USGS 1:24000 topographic map, Guijarral Hills quadrangle (1991)〕
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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