时移成像条件下的波动方程叠前深度偏移  

Prestack depth migration based on wave equation using time-shift imaging condition

作　　者：徐秀刚[1] 李振春[1] 叶月明[1] 仝兆岐[1] 秦德文[1] 

机构地区：[1]中国石油大学地球资源与信息学院,山东东营257061

出　　处：《中国石油大学学报（自然科学版）》2009年第5期46-49,共4页Journal of China University of Petroleum(Edition of Natural Science)

基　　金：国家'863'计划项目(2006AA06Z206);国家'973'计划项目(2007CB209605);中国石油大学(华东)研究生创新基金项目(B2009-12)

摘　　要：为提高炮域叠前深度偏移的计算效率,引入时移成像条件进行叠前深度偏移。基于频率空间域有限差分波场延拓算子进行延拓,采用时移成像条件来求取大延拓步长间的层位成像值,成像条件虽然增加一次逆傅里叶变换,但对计算时间的影响却不大。脉冲响应和Marmousi模型的测试结果表明,所提出的方法在得到与小步长效果相当的成像结果的同时,又可以成倍地提高计算效率。In order to improve the efficiency of prestack depth migration of shot field, time-shift imaging condition was used for prestack depth migration. Based on frequency space finite difference operator for continuation, the time-shift imaging condition was used to get the imaging results of the layers among the larger continuation step. Though another inverse Fourier transform is needed, it has little effect on the computational efficiency. The impulse and Marmousi model test results show that the proposed method doubles the computational efficiency with the imaging results equivalent to the results of small step.

关 键 词：叠前深度偏移 时移成像条件 计算效率 波动方程 

分 类 号：P631.443[天文地球—地质矿产勘探]