【摘要】 横波速度测井曲线是叠前地震反演必不可少的资料,在储层预测中起着非常重要的作用,但在研究中比较缺乏。考虑到地下储层的复杂多样性,为了准确求取地下储层的横波速度曲线,通过对碳酸盐岩储层物性的分析及其裂缝对储层的各向异性分析,根据其特征,首次建立了各向异性碳酸盐岩储层的岩石物理理论模型,并依据此模型对各向异性碳酸盐岩储层的横波速度进行了估算。在此基础上,引入反演的思想,利用测井约束反演及叠前地震道集的弹性波形反演等方法,对基于岩石物理理论模型的初步估算横波速度进行了修正,确保了估算结果的准确性,得到了与地下储层更加吻合的精细横波速度;通过实际资料试算,对估算横波与实测横波进行了对比分析。结果表明,该估算方法可成功模拟各向异性碳酸盐岩储层的横波速度,并在实际工区得到很好的应用。更多还原

【Abstract】 The shear wave velocity is absolutely necessary in pre-stack seismic inversion,it plays very important role in reservoir prediction,but it is usually unavailable in research.Considering the complexity and multiplicity of subsurface reservoirs,in order to exactly calculate the S-wave velocities of subsurface reservoirs,we analyzed carbonate reservoir and the anisotropy effect of fracture on reservoir,established the physics theoretical models of isotropy and anisotropy carbonate reservoir based on its characteristics firstly.The S-wave velocity is estimated on the basis of the established model.And then,the idea of inversion is introduced,the estimated S-wave velocity can be corrected using well-log constrained inversion method and elastic waveform inversion method.Real data is used to test and analyze these methods.The comparing analysis of evaluated and metrical S-wave velocity show that the method proposed in this paper can be well used in S-wave velocity evaluation of isotropy and anisotropy carbonate reservoir.The proposed method has good application in real data and better application prospect.更多还原