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

摘要： 若异常压力气藏生产中存在反凝析现象,相态变化会使p/Z-G_p图中直线段明显偏转.若以没有考虑相态变化的物质平衡方程为基础核实储量,即使考虑储层压实等因素,也必须选择压力高于储层气露点压力的数据,即对应p/Z-G_p图中的第一直线段.提出一种综合考虑流体及岩石压缩性、小范围稳态含水层和页岩水流入条件下只依据生产和气体组分数据唯一确定原始储量和综合压缩系数的最优化方法,给出了应用实例.

关键词: 异常压力气藏, 地层压力, 最优化, 地质储量