Abstract:Real earth media are characterized by the visco-elasticity,so it is necessary to consider the absorption and attenuation effects in the full waveform inversion.In this paper,we propose a visco-acoustic wave full waveform inversion in the 2D time-domain.According to the visco-elastic wave equation based on generalized standard linear solid (GSLS) model,a first-order velocity-stress visco-acoustic wave equation is obtained.Then the corresponding P-wave velocity gradient is derived.Based on high-order staggered-grid finite-difference method and conjugate gradient method,the visco-acoustic full waveform inversion in the 2D time domain based on first-order velocity-stress visco-acoustic wave equation is realized.Numerical examples demonstrate the effectiveness of the proposed method.Compared with other methods without considering the absorption and attenuation effects,the P-wave velocity inversion results with the proposed method are much more accurate.
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Li Haishan, Yang Wuyang, Yong Xueshan. Visco-acoustic wave full waveform inversion in the 2D time domain. Oil Geophysical Prospecting, 2018, 53(1): 87-94.
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