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在测井解释、试气数据、储层物性、单井分析化验等地质资料的基础上,根据统计学原理和低渗透气藏流体渗流原理,首先进行研究区储层四性关系解释,进而采用试气法进行有效厚度电性下限确定,采用测试法、毛管压力曲线法、经验统计法进行有效厚度物性下限确定。分析结果显示,鄂尔多斯盆地东南部上古生界石盒子组盒8段电性下限为声波时差≥210μs/m,深侧向电阻率≥30Ω·m,泥质含量≤21%,密度≤2.50 g/cm3,含水饱和度≤55%;物性下限渗透率为0.08 m D,孔隙度为5%。
Based on the geological data such as logging interpretation, test gas data, reservoir physical properties and single-well analysis and other geological data, according to the principle of statistics and the principle of fluid seepage in low-permeability gas reservoirs, the four-layer relationship of reservoirs is first explained, The gas test method is used to determine the lower limit of the effective electrical thickness, and the lower limit of the effective thickness physical property is determined by the test method, the capillary pressure curve method and the empirical statistical method. The results show that the lower limit of electrical conductivity of box 8 in the Upper Paleozoic Shixianzi Formation in southeastern Ordos Basin is sonic time difference ≥210μs / m, deep lateral resistivity ≥30Ω · m, shale content ≤21%, density ≤2.50 g / cm3 , Water saturation ≤ 55%, lower permeability of physical properties 0.08 m D, porosity of 5%.