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地震各向异性是沉积岩石中广泛存在的波动现象,为研究地球介质岩石力学性质提供了有效途径.本文从横观各向同性岩石的本构方程出发,利用介质分解理论和地震波扰动理论,推导了沿TI介质对称轴和对称面上杨氏模量和泊松比的显式近似方程.经实验数据验证了本文近似方程的合理性,发现在各向异性强度适中的条件下,两个主方向杨氏模量和沿对称面泊松比的近似值与实测值吻合度较高,沿对称轴方向泊松比近似值偏小,但近似结果反映了真实值的宏观趋势.实际资料试处理表明,页岩地层岩石力学参数具有较强各向异性,利用本文近似方程可有效估算各向异性杨氏模量和泊松比,为储层压裂工程提供了岩石力学数据.
Seismic anisotropy is a widely fluctuating phenomenon in sedimentary rocks and provides an effective way to study the rock mechanics properties of the earth.In this paper, based on the constitutive equations of transversely isotropic rocks, the theory of medium decomposition and the theory of seismic disturbance are derived The explicit approximation equation of Young’s modulus and Poisson’s ratio along the axis of symmetry and symmetry of the TI medium is validated by the experimental data.The approximate equation of this paper is reasonable and found that under the condition of moderate anisotropy intensity, The approximate values of Young’s modulus and Poisson’s ratio along the symmetry plane are in good agreement with the measured values, and the Poisson’s ratio along the axis of symmetry is smaller than the approximate value, but the approximate result reflects the macro trend of the real value. The rock mechanics parameters of rock stratum have strong anisotropy. By using the approximate equations in this paper, the Young’s modulus and Poisson’s ratio of anisotropy can be effectively estimated, and rock mechanics data are provided for reservoir fracturing engineering.