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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.
The perturbation theory is used to derive the basic formula for forward and backward calculation of weak anisotropy (WA) media parameters. A method to determine WA parameters in the presence of a component of known slowness vector and polarization vector is given. If this method Was used for a single walkawayVSP dataset to obtain nine WA parameters that fully determine the propagation of qP and two qS waves in a plane determined by cross-section and drilling The numerical simulation of the generation of single walkawayVSP observation system and the inversion of WA parameters are carried out. The WA parameters that can be determined and their reliability are discussed in detail.