裂隙各向异性介质一维双分量参数反演

1-D 2-COMPONENT INVERSION FOR FRACTURED ANISOTROPIC MEDIA

长春地质学院,长春130026

Changchun Geology College, Chang chun 130026

各向异性介质一维双分量反演是确定介质双本征方位的有效方法。对主轴是水平方位分布时的裂隙各向异性介质,用这种方法可以确定裂隙的走向、倾向和裂隙分布密度。本文根据Hudson提出的裂隙各向异性介质本构方程,用有限元法进行了正演模拟,得到了R_2×2矩阵剖面。再根据Alford和Winterstein提出的座标旋转的参数反演方法进行了反演。通过数值运算,说明方法是可行的,结果是满意的。

1-D 2-component inversion for anisotropic media is effective to determine the dual intrinsic orientation of media. For fractured anisotropic media with its principal axes horzontally distributed, this technique can be used to determine the strike, trend, and the distribution density of fractures. Based on Hudson’s constitutive equations for fractured anisotropic media, a matrix (R_2×2) section is achieved via forward modelling by means of the finite element method, then the following inversion is carried out by means of the rotating coordinate parametric inversion proposed by Alfond and Winterstein. Numerical experiments show that the method is practicable and can produces desired results.