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川西拗陷东坡沙溪庙组为低渗、低孔致密岩性气藏,存在低电阻率储层测试产气不产水,而相对较高电阻率测试气水同产现象。从测井四性关系出发,通过数学模型及岩石实验分析资料的分析,认为该区电阻率值是主要受孔隙度、孔隙结构、储层含流体情况共同影响,低电阻储层主要由砂岩非均质性、储集层微观结构、高束缚水饱和度引起的。在此基础上提出电阻率孔隙度重叠法、多指标雷达图法、电阻率孔隙度斜率法对该气藏进行测井评价,彻底摆脱该区以前简单的测井储层识别和评价标准,同时采用毛管水可动性分析模型对高束缚水饱和度储层分析其毛管水可动概率,提高了该区测井解释精度,更有利于发现潜在低电阻率储层。
Shaximiao Formation on the east slope of western Sichuan depression is a low-permeability and low-porosity tight lithologic gas reservoir. There are low resistivity reservoirs to test gas production without water and relatively high resistivity to test gas and water production. Based on the four-log relationship, through mathematical model and analysis of rock experimental data, it is considered that the resistivity value in this area is mainly affected by the porosity, pore structure and reservoir-containing fluids. The low resistance reservoirs are mainly composed of sandstone Homogeneity, reservoir microstructure, high irreducible water saturation. On this basis, resistivity porosity overlap method, multi-target radar plot method and resistivity porosity slope method are applied to log evaluation of this gas reservoir and get rid of the simple criteria of well logging reservoir identification and evaluation before. The capillary water mobility analysis model is used to analyze the capillary water mobile probability of high irreducible water saturation reservoirs and improve the interpretation accuracy of logging data in this area, which is more conducive to the discovery of potential low resistivity reservoirs.