Zoeppritz equation-based prestack inversion and its application in fluid identification

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Abstract Prestack seismic inversion methods adopt approximations of the Zoeppritz equations to describe the relation between reflection coefficients and P-wave velocity, S-wave velocity, and density. However, the error in these approximations increases with increasing angle of incidence and variation of the elastic parameters, which increases the number of inversion solutions and minimizes the inversion accuracy. In this study, we explore a method for solving the reflection coefficients by using the Zoeppritz equations. To increase the accuracy of prestack inversion, the simultaneous inversion of P-wave velocity, S-wave velocity, and density by using prestack large-angle seismic data is proposed based on generalized linear inversion theory. Moreover, we reduce the ill posedness and increase the convergence of prestack inversion by using the regularization constraint damping factor and the conjugate gradient algorithm. The proposed prestack inversion method uses prestack large-angle seismic data to obtain accurate seismic elastic parameters that conform to prestack seismic data and are consistent with logging data from wells.

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	Huang Han-Dong
	Wang Yan-Chao
	Guo Fei
	Zhang Sheng
	Ji Yong-Zhen
	Liu Cheng-Han

Key words： Prestack inversion Zoeppritz equation simultaneous inversion fluid identification

Received: 2014-12-22;

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This research work is supported by the 973 Program of China (No. 2011CB201104 and 2011ZX05009) and the National Science and the Technology Major Project (No. 2011ZX05006-06).

Cite this article:

Huang Han-Dong,Wang Yan-Chao,Guo Fei et al. Zoeppritz equation-based prestack inversion and its application in fluid identification[J]. APPLIED GEOPHYSICS, 2015, 12(2): 199-211.

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