关键词: 异常压力气藏, 地层压力, 最优化, 地质储量

Abstract: Through the analysis of production data from several abnormal－pressured gas reservoirs,it is concluded that the reasons,why their p/Z－G_pplots can't meet the linear behavior,are the compaction of reservoirs,the compressibility of the interstitial fluids,and an influx of shale water,as well as the changes of the phases of reservoir fluids when the formation pressure is below the dew－point pressure and the reverse condensate phenomenon happens.We must choose those production data.of which the reservoir pressure is higher than the dew－point,and those data must be corrected before being used.Based on the material balance equation,an optimization method is proposed for determining the formation comprehensive compressibility and OGIP (original gas in place) of abnornial－pressured gas reservoirs.With this method,compressibility of fluids and rock in the reservoirs and influxes of water of limited water－bearing zones and shale are considered comprehensiveiy,and it is merely needs data in production and gas composition to get precisely OGIP and the comprehensive compressibility.It can give unique solution and be especially suitable for computer programming.

Key words: abnormal-pressured gas reservotr, formation pressure, opttmtxatton, OGIP