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oil depletion
Oil depletion is the decline in oil production of a well, oil field, or geographic area.〔US Energy Information Administration, (Accelerated depletion )〕 The Hubbert peak theory makes predictions of production rates based on prior discovery rates and anticipated production rates. Hubbert curves predict that the production curves of non-renewing resources approximate a bell curve. Thus, according to this theory, when the peak of production is passed, production rates enter an irreversible decline.
The United States Energy Information Administration predicted in 2006 that world consumption of oil will increase to (mbd) in 2015 and 118 million barrels per day in 2030.〔(【引用サイトリンク】title=International Energy Outlook 2011 - Energy Information Administration )〕 With 2009 world oil consumption at 84.4 mbd,〔(Total Consumption of Petroleum Products (Thousand Barrels Per Day) )〕 reaching the projected 2015 level of consumption would represent an average annual increase between 2009 and 2015 of 2.7% per year.
== Resource availability ==
(詳細はWorld's natural oil supply is fixed because petroleum is naturally formed far too slowly to be replaced at the rate at which it is being extracted. Over many millions of years, plankton, bacteria, and other plant and animal matter became buried in sediments on the ocean floor. When conditions were right – a lack of oxygen for decomposition, and sufficient depth and temperature of burial – these organic remains were converted into petroleum compounds, while the sediment accompanying them was converted into sandstone, siltstone, and other porous sedimentary rock. When capped by impermeable rocks such as shale, salt, or igneous intrusions, they formed the petroleum reservoirs which are exploited today.〔Abhijit Y. Dandekar. ''Petroleum reservoir rock and fluid properties''. CRC Press, 2006. p. 1. ISBN 0-8493-3043-2〕
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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