Method and application of VSP anisotropic vector wavefiled decomposion
Sun Zan-dong1,2, Li Qiang1,2, Sun Wen-bo1,2, Bai Hai-jun1,2
1. Lab for Integration of Geology and Geophysics, Faculty of Resources and Informatics, China University of Petroleum(Beijing), Beijing, 102249, China;
2. State Key Lab of Petroleum Resources and Prospecting, China University of Petroleum, Beijing, 102249, China
Abstract：This paper introduces a vector wave field separation method for 3D 3C VSP data which is under anisotropic hypothesis.Using the common shot 3C data rotated once,the anisotropic Thomsen's parameters at the downhole receivers are inverted by using a nonlinear SQP method.After computing propagation angle,slowness and polarization vectors for each plane wave (upgoning P,downgoing P,upgoing S and downgoing S wave),a regularized generalized inverse algorithm in frequency domain is applied to determine the Fourier plane-wave amplitudes.Wave filed separation in time domain is realized by inverse Fourier transform.The feasibility and stability of the method is proven by application to two forward modeled VSP data and one field zero-offset 3C VSP data.Additionally,the superiority of this algorithm is shown by comparison of this algorithm with the isotropic vector inversion method.
孙赞东, 李强, 孙文博, 白海军. VSP各向异性矢量波场分离方法研究及其应用[J]. 石油地球物理勘探, 2011, 46(增刊1): 17-26.
SUN Zan-Dong, LI Qiang, SUN Wen-Bo, BAI Hai-Jun. Method and application of VSP anisotropic vector wavefiled decomposion. OGP, 2011, 46(增刊1): 17-26.
