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The Coal Oil Point seep field offshore from Santa Barbara, California is a petroleum seep area of about three square kilometres, adjacent to the Ellwood Oil Field, and releases about 40 tons of methane per day and about 19 tons of reactive organic gas (ethane, propane, butane and higher hydrocarbons), about twice the hydrocarbon air pollution released by all the cars and trucks in Santa Barbara County in 1990.〔(J. Scott Hornafius and others, "The world's most spectacular marine hydrocarbon seeps (Coal Oil Point, California): quantification of emissions," ''Journal of Geophysical Research'', v.104, n.C9, 15 September 1999, p.20,709 ), PDF file, downloaded 28 January 2009.〕 The liquid petroleum produces a slick that is many kilometres long and when degraded by evaporation and weathering, produces tar balls which wash up on the beaches for miles around.〔 (UCSB Hydrocarbon Seeps project ) 〕 This seep also releases on the order of of liquid petroleum per day. The field produces about 9 cubic meters of natural gas per barrel of petroleum.〔 Leakage from the natural seeps near Platform Holly, the production platform for the South Ellwood Offshore oilfield, has decreased substantially, probably from the decrease in reservoir pressure due to the oil and gas produced at the platform.〔 __NOTOC__ ==See also== *Coal Oil Point Natural Reserve *Santa Barbara channel 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「Coal Oil Point seep field」の詳細全文を読む スポンサード リンク
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