Prestack density inversion using the Fatti equation constrained by the P-and S-wave impedance and density

作     者：梁立锋 张宏兵 但志伟 许自强 刘秀娟 曹呈浩 

作者机构：河海大学地球科学与工程学院江苏南京210098 中海油能源发展工程技术物探技术研究所广东湛江524000 

出 版 物：《Applied Geophysics》 (应用地球物理（英文版）)

年 卷 期：2017年第14卷第1期

页      面：133-141,191页

核心收录：

学科分类：081801[工学-矿产普查与勘探] 081802[工学-地球探测与信息技术] 08[工学] 0818[工学-地质资源与地质工程] 

基　　金：supported by the National Nature Science Foundation of China(Nos.41374116 and 41674113) the project of CNOOC(No.CNOOC-KJ 125 ZDXM 07 LTD NFGC 2014-04) 

主　　题：density inversion Fatti sensitivity 

摘      要：Simultaneous prestack inversion is based on the modified Fatti equation and uses the ratio of the P- and S-wave velocity as constraints. We use the relation of P-wave impedance and density （PID） and S-wave impedance and density （SID） to replace the constant Vp/Vs constraint, and we propose the improved constrained Fatti equation to overcome the effect of P-wave impedance on density. We compare the sensitivity of both methods using numerical simulations and conclude that the density inversion sensitivity improves when using the proposed method. In addition, the random conjugate-gradient method is used in the inversion because it is fast and produces global solutions. The use of synthetic and field data suggests that the proposed inversion method is effective in conventional and nonconventional lithologies.