各向异性介质中反射率法波场模拟及体波辐射图案

本文从一般各向异性的弹性动力学方程出发，采用反射率法来计算任意各向异性的黏弹性层状介质中的全波场合成地震记录。系统矩阵的特征解是在三维空间计算的，考虑了偏离径向平面的波传播。时间假频由复频率技术来压制，空间假频则通过使用Ｆｉｌｏｎ法估计两个波数的积分来避免。文中以裂隙介质和叠层－裂隙复合介质为例，给出了各向异性介质中合成地震记录计算的实用方法，并分析了横波分裂现象及振幅特征。

Wave field simulation using reflectivity method and body-wave radiation patterns in anisotropic media

By adopting reflectivity method,we derive full-wave synthetic seismograms inany anisotropic viscoelastic layered-media from the elastodynamic equations in usualanisotropic media. Eigensolutions of system matrix are computed in three dimensions,and the wave propagation deviating from sagittal plane is considered also.Temporal wraparound is avoided by using complex frequencies,and spatial aliasingby taking Filon's method to estimate 2 wavenumber integrals. In additi0n, we describe the methods for obtaining synthetic seismograms in anisotropic media:EDAand the composite of EDA and PTL. Shear wave splitting and the amplitude characters are analysed reasonably.Energy focusing in elastic anisotropic medium changes the energy distributionsof incident and reflected wavefronts to distort AVO characteristics. Body wave radiation patterns in transversely isotropiccmedia are analysed numerically and analytically. The Approximate formulae are given which can be used to easy estimate theinfluence of radiation pattern distortion upon AVO.