Preserved amplitude migration based on the one way wave equation in the angle domain  

基于单程波方程的角度域保幅偏移(英文)

作　　者：叶月明[1] 李振春[1] 徐秀刚[1] 朱绪峰 仝兆岐[1] 

机构地区：[1]中国石油大学(华东)地球资源与信息学院 [2]中国石油东方地球物理公司,河北涿州072751

出　　处：《Applied Geophysics》2009年第1期50-58,103,共10页应用地球物理（英文版）

基　　金：supported by the National 863 Program(Grant No.2006AA06Z206);the National 973 Program(Grant No.2007CB209605);CNPC geophysical laboratories and Ph.D innovative funding in China University of Petroleum(East China)

摘　　要：Traditional pre-stack depth migration can only provide subsurface structural information. However, simple structure information is insufficient for petroleum exploration which also needs amplitude information proportional to reflection coefficients. In recent years, pre-stack depth migration algorithms which preserve amplitudes and based on the one- way wave equation have been developed. Using the method in the shot domain requires a deconvolution imaging condition which produces some instability in areas with complicated structure and dramatic lateral variation in velocity. Depth migration with preserved amplitude based on the angle domain can overcome the instability of the one-way wave migration imaging condition with preserved amplitude. It can also offer provide velocity analysis in the angle domain of common imaging point gathers. In this paper, based on the foundation of the one-way wave continuation operator with preserved amplitude, we realized the preserved amplitude prestack depth migration in the angle domain. Models and real data validate the accuracy of the method.传统叠前深度偏移只能够提供地下的构造信息,但工业界在需要构造信息的同时还要与地下界面反射系数成比例的振幅信息。最近几年,基于单程波方程的保幅叠前深度偏移算法有了一定的发展,但是,基于炮域、单程波的保幅型叠前深度偏移必须应用反褶积型的成像条件,这种成像条件在构造复杂、速度变化剧烈的地区会出现不稳定现象。基于角度域的保幅深度偏移克服了这一不稳定性缺点的同时,还域的保幅深度偏移,模型和实际资料的试算分析验证该思路方法的正确性和有效性。

关 键 词：Preserved amplitude prestack depth migration angle domain one way wave equation imaging conditions 

分 类 号：P631.4[天文地球—地质矿产勘探]