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本文利用X射线CT获取反映岩心微观结构的三维数字岩心,利用数学形态学中的开运算模拟了岩石的油驱水排驱过程中,不同含水饱和度下油和地层水在孔隙空间中的分布。利用有限元方法计算了岩石电阻率,进而得到岩石地层因素和电阻率指数,并考查了岩石润湿性对岩石电阻率指数的影响。数值模拟结果表明:基于数字岩心的水湿岩石地层因素和电阻率指数数值模拟结果与实验结果一致,拓展了岩石电阻率实验的能力;岩石润湿性对岩石电性有重要影响,在相同含水饱和度下,油湿岩石电阻率高于水湿岩石电阻率,油湿岩石饱和度指数远大于水湿岩石饱和度指数。
In this paper, a three-dimensional digital core reflecting core microstructure was obtained by X-ray CT. The open operation in mathematical morphology was used to simulate the distribution of oil and formation water in pore space under different water saturations . The resistivity of rock was calculated by finite element method, then the rock formation factor and resistivity index were obtained. The influence of rock wettability on resistivity index of rock was also investigated. The numerical simulation results show that the numerical simulation results of water wet rock stratum and resistivity index based on digital core agree well with the experimental results, which expands the ability of rock resistivity experiment. Rock wettability has an important influence on rock electrical properties. Under saturation, the resistivity of oil-wet rock is higher than that of water-wet rock, and the index of oil-wet rock saturation is far greater than that of water-wet rock.