Abstract：According to finite-frequency theory, for a single source-receiver pair, not only the media on the raypath but also those outside the ray affects the wave propagation. This kind of effect can be described by sensitivity kernel which is always calculated based on "wavepath" with low efficiency. While the adjoint-state method based on ray theory ignores the finite-frequency characteristics of wave propagation, which leads to poor imaging. In this paper, we propose a new approach which combines the adjoint-state method and finite-frequency theory. Numerical experiments using it in near-surface velocity structure inversion indicate that the proposed approach can achieve results with higher accuracy than the traditional nonlinear ray-based tomography method.
谢春, 刘玉柱, 董良国, 杨积忠. 基于声波方程的有限频伴随状态法初至波旅行时层析[J]. 石油地球物理勘探, 2015, 50(2): 274-282.
Xie Chun, Liu Yuzhu, Dong Liangguo, Yang Jizhong. First arrival tomography with finite frequency adjoint-state method based on acoustic wave equation. OGP, 2015, 50(2): 274-282.
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