应用逾渗网络模型研究几种不同孔渗储层岩石的电性特征

Application of percolation network to study electric property of reservoir rocks with different porosity and permeability

根据不同孔渗特性储层岩心分析资料,建立了反映特定储层孔隙结构特征的三维逾渗网络模型。首先通过模拟结果和实验结果的对比,分析了不同孔渗储层电性的总体特征,然后通过数值模拟研究了地层水电阻率、泥质含量等对不同孔渗岩石电性的影响。研究结果表明:随着孔渗特性的降低,相同含水饱和度下电阻率升高;低孔低渗储层的束缚水饱和度大于高孔高渗储层。地层水电阻率、泥质含量等对岩石电性的影响同储层的孔渗特性有关:地层水电阻率、泥质含量等对低孔低渗储层岩石电性的影响幅度明显大于对高孔高渗储层岩石电性的影响幅度;当黏土阳离子交换浓度较低时,泥质对低孔低渗储层岩石的电性也有较大的影响。在低孔低渗储层电性研究及测井评价中,准确求取地层水电阻率、泥质含量等物性参数具有重要意义。

The 3-D percolation network reflecting porous structural feature of special reservoir is built up based on analytic data of reservoir cores with different property of porosity and permeability. Firstly, the total feature of electricity of reservoir with different porosity and permeability is analyzed by correlation of simulating results with experimental results; then, the influence of resistivity of formation water and shaliness on electric property of rocks with different porosity and permeability is stud...