A petrophysical model of shales considering soft-mineral aspect ratios and its application
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摘要: 以往针对页岩储层的岩石物理建模常忽略孔隙类型与软矿物纵横比对弹性模量的影响。本文同时考虑孔隙类型、孔隙形状与软矿物纵横比, 建立横向各向同性页岩岩石物理模型:将固体矿物分为硬矿物与软矿物两类, 考虑软矿物的各向异性特征与形状变化; 基于储层实际情况将孔隙分为粒内孔、有机孔与粒间孔三类, 孔隙形状分为硬孔隙与软孔隙两种; 最后, 利用粒子群法反演输入参数, 进一步计算纵横波速度、各向异性参数与岩石力学参数。结合实际资料应用, 用已知测井横波速度与各向同性岩石力学计算结果进行对比, 结果表明该模型的应用效果较好。Abstract: Previous petrophysical modeling of shale reservoirs often ignored the influence of pore types and soft-mineral aspect ratios on the elastic modulus.This study built a petrophysical model for transversely isotropic shales considering pore types and shapes, and soft-mineral aspect ratios.In this study, solid minerals were divided into hard and soft minerals, and soft minerals' anisotropic characteristics and shape changes were considered.According to the actual conditions of reservoirs, pores were categorized into intragranular, organic, and intergranular pores, and they were classified into stiff and soft pores based on their shapes.Finally, the input parameters were inverted using the particle swarm optimization algorithm to further calculate compressional and shear wave velocities, anisotropy parameters, and rock mechanical parameters.Combined with the actual data application, the results of this study were compared with the known results of shear wave velocity and isotropic rock mechanical calculation, suggesting that the model in this study is effective.
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