关于油气资源探明程度的探讨

油气资源探明程度是反映勘探程度的重要指标之一,由于国内外采用的资源量和储量概念不一样,因而其资源探明程度的含义就不一致,如果不加区别简单的对比,将给人以误导。根据目前国内外油气资源量和储量的不同涵义,将油气资源探明程度分为地质资源探明程度和可采资源探明程度。地质资源探明程度是指累计探明地质储量与地质资源量的比值,可采资源探明程度是指累计探明可采储量与可采资源量比值。经计算,截至2000年,中国石油和天然气地质资源探明程度分别为20.5%和7.7%,可采资源探明程度分别为52.5%和17.4%;而世界石油和天然气可采资源探明程度分别为57.3%和50.3%,其中,美国石油和天然气可采资源探明程度分别为56.4%和57.6%。与世界和美国对比,中国石油资源探明程度与世界或美国平均值相差不大,而天然气资源探明程度却远低于世界及美国的平均水平。

DISCUSSION ON DISCOVERY DEGREE OF PETROLEUM RESOURCES

A discovery degree of petroleum resources is one of important factors that indicate petroleum exploration maturity.Because of the concepts of resources and reserve used in China and other countries are different,the terms of the discovery degrees used by them have also not same meaning.A misunderstanding might be made when the magnitude of the discovery degrees with different meanings are directly compared. According to the different meanings of resources and reserve concepts used at home and abroad,the discovery degrees of petroleum resources in place and recoverable resources have been introduced in this paper.The discovery degree of petroleum resources in place is the percentage of cumulative proven reserves in place with respect of total resources in place;the discovery degree of recoverable petroleum resources refers to the percentage of cumulative proven recoverable reserves with respect of total recoverable resources.By the end of 2000,the discovery degree of oil and gas resources in place in China is 20.5% and 7.7%, respectively,the discovery degree of recoverable oil and gas resources in China is 52.5% and 17.4% respectively;the discovery degree of recoverable oil and gas resources in the world is 57.3% and 50.3% respectively; the discovery degree of recoverable oil and gas resources in the U.S. is 56.4% and 57.6% respectively.Hence,the difference between the discovery degrees of recoverable oil resources in China and the world (or in the U.S.) is not too large,but the discovery degree of gas recoverable resources in China is much lower than that in the world and the U.S.