【摘要】 利用微扰理论推导了弱各向异性(WA)介质参数正反演计算的基本公式;给出了在已知慢度矢量的一个分量和偏振矢量情况下确定WA参数的方法.如果这一方法被用于单一的变井源距垂直地震剖面(walkawayVSP)资料,可以获得9个WA参数.这9个WA参数完全决定了qP波和两个qS波在由剖面和钻井所决定的平面内传播的特性.对单条walkawayVSP观测系统数据的产生和WA参数的反演进行了数值模拟计算,对所能确定的WA参数及其可靠性进行了详细的讨论.更多还原

【Abstract】 Forward and inversion formulae are derived for the weakly anisotropic(WA) media by using the perturbation theory.We present a method to determine the WA parameters when the polarization vector and one component of slowness vector are known.If this method is applied to a single walkaway VSP data,9 WA parameters can be obtained.The WA parameters completely determine the property of qP wave and two qS waves propagating in a plane composed of the profile and drill well.A walkaway VSP model test was carried out to generate polarization vector and a component of slowness vector as "observed data".The data set are inverted for the 9 WA parameters to test the accuracy and reliability of the presented formulae.更多还原