各向异性介质中的方位AVO

本文从各向异性介质的弹性波波动方程方程出发，推导出各向异性介质界面上３６个反射和透射系数的计算公式。裂隙介质中Ｐ－Ｐ波系数计算结果表明，在垂直裂隙与方位各向同性介质所构成的界面上，Ｐ－Ｐ波反射系数在平行于裂隙方向达到极大值，在垂直于裂隙方向的出现极小值。

Azimuthal AVO in anisotropic medium

36 formulae of reflection and transmission coefficients on anisotropic interface are derived from elastic wave equation in anisotropic medium.The computation result of P-P wave reflection coefficients in fractured mediumsays that on an interface consisting of vertical fractures and azimuthal isotropic medium, P-P wave reflection coefficient (absolute value ) comes up to maximum in direction paralleling fracture, but gets minimum in direction perpendicular to frac-ture. Dip angle of fracture influences the AVO characteristic of P-P wave, minor dip angle resulting in gentler AVO phenomenon. On the interface where there are non-horizontal fractures, reflection coefficient of P-P wave has more extrema to show complexity and to fail to directly indicate fracture strike. In a word, the az-imuthal AVO characteristic of compressional wave is cl0se related to the azimuth,dip angle and density of fractures.