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最小经济储量规模的确定,可以减小油气田勘探部署的盲目性,只有找到的探明储量大于最小经济储量规模，该探区才有可能部署勘探开发工作量。文章采用净现值法，根据油气田地理环境、地质特征、流体性质、天然气价格、勘探和开发投资、税收及考虑资金时间价值等情况，建立了最小天然气田经济储量规模模型，并用该模型分别计算了松辽盆地十屋断陷常规气藏不同天然气价格下、不同气藏埋深的最小经济储量规模系列。通过净现值法计算出的最小经济储量规模，提供了十屋断陷天然气勘探规模的经济界限。

EVALUATING THE MINIMUM ECONOMIC RESERVES BY NET PRESENT VALUE METHOD IN SHIWU SAG 1)

Identification of minimum economic reserves can reduce the blindness of oil/gas exploration programs. Only where are the proven reserves more than the minimum economic reserves, the region can be developed. With net present value method, according to the geography circumstance, the geologic features, the fluid property, the gas price, the exploration and development investment, the revenue, and the bankroll time value, etc., the model of minimum economic reserves is established for gas fields. With the model, the minimum economic reserves series are calculated for common gas reservoirs of Shiwu sag in Songliao basin under different gas prices and different buried depths separately. The minimum economic reserves calculated with net present value method offer the economic limitation of gas exploration in Shiwu sag.