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    188宝金博页面版: Zoeppritz equation-based prestack inversion and its application in fluid identification

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    内容提示： 199Manuscript received by the Editor December 22, 2014; revised manuscript received April 16, 2015.*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).1. State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum-Beijing, Beijing 102249, China.2. College of Enhanced Oil Recovery, China University of Petroleum-Beijing, Beijing 102249, China.3. Research Ins...

    文档格式：PDF | 页数：13 | 浏览次数：101 | 上传日期：2015-12-29 16:06:33 | 文档星级：
    199Manuscript received by the Editor December 22, 2014; revised manuscript received April 16, 2015.*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).1. State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum-Beijing, Beijing 102249, China.2. College of Enhanced Oil Recovery, China University of Petroleum-Beijing, Beijing 102249, China.3. Research Institute, CNOOC Ltd.-Shenzhen, Guangzhou 510240, China. 4. School of Geophysics and Oil Resources, Yangtze University, Wuhan 434023, China.♦Corresponding author: Wang Yan-Chao (Email: wangyanchao86421@sina.com)© 2015 The Editorial Department of APPLIED GEOPHYSICS. All rights reserved.Zoeppritz equation-based prestack inversion and its application in fl uid identifi cation*APPLIED GEOPHYSICS, Vol.12, No.2 (June 2015), P. 199-211, 16 Figures.DOI: 10.1007/s11770-015-0483-3Huang Han-Dong 1,2 , Wang Yan-Chao ♦1,2 , Guo Fei 3 , Zhang Sheng 1,2 , Ji Yong-Zhen 1 , and Liu Cheng-Han 4Abstract: 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 refl ection coeffi cients 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.Keywords: Prestack inversion, Zoeppritz equation, simultaneous inversion, fl uid identifi cationIntroductionPrestack seismic inversion uses amplitude-versus-offset attributes in prestack seismic data of different incident angles to obtain P- and S-wave velocity, density, and elastic moduli, and map the lateral variations in oil- and gas-bearing reservoirs. Therefore, prestack inversion is important for reservoir prediction and hydrocarbon detection in production and development of complex oil and gas reservoirs. Prestack inversion is primarily based on the Zoeppritz equations (Zoeppritz, 1919), which describe the energy distribution between reflection and transmission when elastic waves enter an elastic interface. However, the Zoeppritz equations cannot be directly applied to seismic exploration because they are complex and of high computational cost. Based on perturbation theory, Aki and Richards (1980) derived an approximation based on P-wave velocity, S-wave velocity, and density by

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