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《Chinese Journal of Geophysics》 2019-01
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Simultaneous inversion of P-and S-wave impedances based on an improved approximation equation of reflection coefficients

FU Xin;ZHANG Feng;LI XiangYang;QIAN ZhongPing;CHEN HaiFeng;MEI LuLu;State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum;CNPC Key Laboratory of Geophysical Prospecting,China University of Petroleum;BGP INC.,China National Petroleum Corporation;  
Prestack inversion utilizing approximate formulas of reflection coefficients is an important tool for exploration of oil and gas.In this paper,we derivate an improved approximation of reflection coefficients in the ray parameter domain.This equation provides a nonlinear relationship between seismic reflection coefficients and P-and S-wave impedance reflectivity,and is more accurately than the conventional linearized equations in the range of small and middle incident angles.Besides,because the new equation contains only the terms of P-and S-wave impedances,the inversion utilizing this equation can efficiently reduce the ill-posedness of the simultaneous inversion of Pwave velocity,S-wave velocity and density.We then develop aprestack seismic inversion methodby combining the generalized linear inversion(GLI)method and the Bayes theory.Both of synthetic and real data tests show the feasibility of this inversion scheme,and for the reason of the assumption that P-and S-wave velocity ratio is constant does not use in the inversion process,the accuracy of inverted results is improved effectively.
【Fund】: 国家重大专项(2017ZX05018005);; 国家自然科学基金(41474096);; 中石油新技术新方法项目(2016A-3305);; 中国石油大学(北京)科研基金(2462018BJC001)联合资助
【CateGory Index】: P631.4
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1 MA Ni;YIN XingYao;SUN ChengYu;ZONG ZhaoYun;School of Geosciences,China University of Petroleum;Laboratory for Marine Mineral Resources,Qingdao National Laboratory for Marine Science and Technology;;Inversion for crustal stress based on azimuthal seismic data[J];地球物理学报;2018-02
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