基于COMSOL的砾岩地层电阻率与含油饱和度关系研究

Study on Relationship Between Resistivity and Oil Saturation of Conglomerate Formation Based on COMSOL

针对砾岩储层岩性复杂、电阻率测井响应受岩石骨架和孔隙结构影响严重的问题,通过建立岩石亲油和岩石亲水2种砾岩地层模型,研究基于COMSOL有限元计算软件的恒定电场中砾岩地层电阻率的三维数值计算方法及复杂砾岩地层模型网格剖分方法,分析各向异性砾岩地层中的电流分布,揭示了砾岩地层电阻率与含油饱和度的关系,给出了由电阻增大系数和含油饱和度数值拟合后确定各向异性砾岩地层岩性参数的方法,为砾岩油藏的评价和解释提供依据,扩展对各向异性的认识。

Due to the complex lithology of conglomerate reservoir,its resistivity logging response is influenced by rock skeleton and pore structure. The numerical models of oleophilic and hydrophilic conglomerate formation are established. The three-dimensional numerical simulation method for calculating the resistivity of conglomerate formation in constant electric field and the grid dividing method of complex conglomerate formation model based on COMSOL software are studied,and the current distribution in anisotropic conglomerate formation is analyzed. The relationship between resistivity and oil saturation of the conglomerate formation is revealed,and the method for calculating the lithology parameters of anisotropic conglomerate formation based on the data fitting of resistivity index and oil saturation is presented. The study results in this paper can provide the theoretical foundation for evaluation and interpretation of conglomerate reservoirs,and expand the understanding of anisotropy.