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碳酸盐岩油藏的强非均质性以及孔隙结构的复杂性,使得作为连接油藏参数与地震参数重要桥梁的岩石物理模型,以及作为油藏预测和定量表征最有效工具的流体替换成为岩石物理建模的难点与重点。在碳酸盐岩储层复杂孔隙结构与地震尺度下碳酸盐岩储层非均质性分析基础上,研究采用岩石网格化方法,将地震尺度下非均质碳酸盐岩储层岩石划分为具有独立岩石参数的均质岩石子体,根据岩石孔隙成因与结构特征采用不同岩石物理模型分步计算岩石子块干岩石弹性模量,并根据不同孔隙连通性进行流体替换,计算饱和不同流体岩石弹性模量。基于计算的岩石子块弹性模量,采用Hashin-Shtrikman-Walpole弹性边界计算理论方法实现地震尺度下碳酸盐岩储层弹性参数计算。通过对含有不同类型孔隙组合碳酸盐岩储层模型的弹性模量进行计算与分析,明确不同孔隙对岩石弹性参数的影响特征,模拟分析结果与实际资料认识一致。
The strong heterogeneity of carbonate reservoirs and the complexity of pore structures make the rock physics model as an important bridge connecting reservoir parameters and seismic parameters and the most effective tool for reservoir prediction and quantitative characterization as Difficulties and Key Points of Rock Physics Modeling. Based on the analysis of the carbonate reservoir heterogeneity under complex pore structure and seismic scale of carbonate reservoir, the rock-grid method is used to study the heterogeneity of carbonate rocks in seismic scale Divided into homogeneous rock sub-bodies with independent rock parameters. Based on the rock pore origin and structural features, different rock physics models are used to calculate the elastic modulus of the rock sub-blocks in steps and replace the fluids according to the connectivity of different pores to calculate the saturation Fluid Rock Elastic Modulus. Based on the calculated elastic modulus of rock subblocks, the elastic parameters of carbonate reservoir under the seismic scale are calculated by Hashin-Shtrikman-Walpole elastic boundary calculation theory. Through the calculation and analysis of the elastic modulus of the carbonate reservoir model with different types of pore combinations, the influence characteristics of different pores on the rock elasticity parameters are clarified. The simulation analysis results are consistent with the actual data.