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| list of countries by proven oil reserves ： ウィキペディア英語版 |
list of countries by proven oil reserves
This is a list of countries by proven oil reserves.
== Methodology ==
Proved preserves are those quantities of petroleum which, by analysis of geological and engineering data, can be estimated, with a high degree of confidence, to be commercially recoverable from a given date forward from known reservoirs and under current economic conditions.
Some statistics on this page are disputed and controversial. Different sources (OPEC, CIA World Factbook, oil companies) give different figures, and there are different types of oil, ranging from cheap and easy to recover oils to shale oil or oil sands, which are more expensive and difficult to recover. For example, in the list below, Australia's total amount of oil does not include shale oil.〔(【引用サイトリンク】title=Climate )〕
Because proven reserves include oil recoverable under current economic conditions, nations may see large increases in proved reserves when known, but previously uneconomic deposits become economic to develop. In this way, Canada's proven reserves increased suddenly in 2003 when the oil sands of Alberta were seen to be economically viable. Similarly, Venezuela's proven reserves jumped in the late 2000s when the heavy oil of the Orinoco was judged economic.
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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