变参考慢度Born近似傅氏偏移  

VARIATIONAL REFERENCE SLOWNESS BORN APPROXIMATION FOURIER MIGRATION

作　　者：杜正聪[1] 贺振华[1] 王志[1] 黄德济[1] 

机构地区：[1]成都理工大学信息工程学院,四川成都610059

出　　处：《吉林大学学报（地球科学版）》2003年第4期555-558,共4页Journal of Jilin University：Earth Science Edition

基　　金：国家973项目资助(G1999043311)

摘　　要：针对常规Born近似傅氏偏移方法对于剧烈横向变速介质不能精确成像的状况而提出了变参考慢度Born近似傅氏偏移,理论上解决了任意速度变化地质模型的偏移成像问题。此外,为进一步提高复杂地层的成像精度和波场延拓算子的稳定性,对散射波场的计算公式作了改进。将改进的方法运用于盐丘模型的正演和偏移试验,并与常规Born近似偏移方法相比较,可明显看出变参考慢度Born近似傅氏偏移方法在效果上要优于后者,其处理速度横向变化的能力大大增强。Due to situation that conventional Born approximation Fourier migration method can not image accurately the media with acute lateral variation of velocity,this paper puts forward variational reference slowness Born approximation Fourier migration method. It can theoretically solve the migration image problem of arbitrary velocity change model. In addition,in order to raise the image accuracy of complex layer and the stability of wavefield extrapolation formula, the scattered wavefield formula is improved. After applying this method to the forward modeling and migration of salt dame model, a better result than the conventional Born approximation migration method can be got. The ability of dealing with lateral velocity variation is greatly increased.

关 键 词：Born近似 散射波场 速度横向变化 波场延拓 GREEN函数 变参考慢度 傅氏偏移 地震勘探 

分 类 号：P631.4[天文地球—地质矿产勘探]