利用波场延拓方法消除焦散影响  

Using wave field continuation method to remove caustic effects

作　　者：崔敬伟[1] 裴江云[2] 朱振宇[3] 张元玉[2] 崔彬[1] 

机构地区：[1]中国地质大学,北京100083 [2]大庆油田有限责任公司勘探开发研究院,黑龙江大庆163712 [3]中国科学院地质与地球物理研究所,北京100101

出　　处：《大庆石油地质与开发》2007年第2期116-119,共4页Petroleum Geology & Oilfield Development in Daqing

摘　　要：在复杂油气藏勘探中,由于上覆地层速度变化大,反射波出现焦散现象,因此与射线走时有关的叠加成像方法(NMO/Stack、NMO/DMO/Stack和Kirchhoff叠前深度偏移)在实际应用中难于对目的层准确地叠加成像。该文针对焦散问题,利用能适应横向变化的偏移算子将地表波场延拓至目的层之上,以消除焦散对目的层成像的影响。Marmousi模型的试算结果表明延拓算法是可行的。In the process of complex reservoir exploration, because of overlying formation varying greatly, reflection wave generates caustic phenomenon. Thus superposed image method related to ray travel time （ NMO/Stack, NMO/ DMO/Stack and Kirchhoff prestack depth migration） is difficult for target layer to correctly superimpose image in practice. This paper aims at caustic problems, by using migration operator which can adopt horizontal variety, and surface wave field continuation is moved above target layer to remove effects of caustic on target layer image. Calculation results of Marmousi model show that continuation method is feasible.

关 键 词：焦散 叠加 延拓 模型 

分 类 号：P631[天文地球—地质矿产勘探]