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Proven reserves
Proven reserves, also called ''proved reserves'', ''measured reserves'', ''1P'', and ''Reserves'', are business or political terms regarding fossil fuel energy sources. (see prove: usage). They are defined as a "Quantity of energy sources estimated with reasonable certainty, from the analysis of geologic and engineering data, to be recoverable from well established or known reservoirs with the existing equipment and under the existing operating conditions."〔(Business Dictionary Proved Reserves )〕 These terms relate to common fossil fuel reserves such as oil reserves (''see main article''), natural gas reserves, or coal reserves.
Operating conditions includes operational break-even price, regulatory and contractual approvals, without which these items cannot be classified as proven and are usually classified into ''probable''. Price changes therefore can have a large impact on classification of proven reserves. Regulatory and contractual conditions may change, and also affect proven reserves amount.
==Numbered terms==
The ''engineering'' term P90 refers to 90 percent engineering probability, is a commonly accepted specific definition by Society of Petroleum Engineers, it does not take into account anything except technical concerns. Therefore, it is different from the business term which does take into account current break-even profitability, and regulatory and contractual approval, but is considered a very rough equivalent. The definition is certainly not universal. Energy Watch Group uses a different definition, P95.
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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