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The Round Mountain Oil Field is a large oil and gas field in the foothills of the Sierra Nevada, about northeast of Bakersfield, California, United States. It is east of the giant Kern River Oil Field, one of the largest in the United States, and also close to the Mount Poso Oil Field and Kern Front Oil Field. With a cumulative total recovery of more than 110 million barrels of oil, it is the 48th largest oil field in California, but remains relatively productive with still about ten percent of its reserves remaining in the ground, according to the California Department of Oil, Gas, and Geothermal Resources (DOGGR).〔(California Department of Conservation, Oil and Gas Statistics, Annual Report, December 31, 2006 ), p. 67〕 ==Setting== The oil field is northeast of the city of Bakersfield, between the Kern River and Poso Creek, in the lower foothills of the Sierra Nevada. The main access to the field is from the south, by way of Round Mountain Road, which also passes through the huge and much more densely developed Kern River Oil Field. Elevations on the Round Mountain Field range from around at Poso Creek to at Round Mountain itself. Topographic relief is high in some parts of the field, especially the northern part of the Main Area, which is intersected by numerous deep canyons. Being mostly within the ecological subsection of the California Central Valley known as the Hardpan Terraces, the predominant native vegetation is needlegrass, with some scrub occurring, especially on north-facing slopes. The climate is hot and arid, with summertime temperatures routinely exceeding ; the mean freeze-free period runs from about 250 to 300 days. Mean annual precipitation is around , almost all as rain and almost all in the winter; summers are generally rainless. Runoff is quick, and streams are dry in the summer and early autumn; water from the area flows out by Poso Creek and the Kern River to closed basins in the southern San Joaquin Valley, including Buena Vista Lake.〔 (Hardpan Terraces subregion description )〕 The field itself is spread out into five named areas, several of which consist of multiple discontiguous productive regions. The Main Area is the largest, consisting of one pool about five miles (8 km) long by half a mile across, extending north to south from Poso Creek to Kern River, and including Round Mountain. North of the main area is the Coffee Canyon Area, and northeast is the Pyramid Area. To the west of the Main Area are the two separate pools in the Sharktooth Area, and the two pools in the Alma Area. The total productive area of the entire field is , or approximately four square miles.〔DOGGR, p. 374-6〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Round Mountain Oil Field」の詳細全文を読む スポンサード リンク
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