波路径偏移压制层间多次波的理论与应用  

Internal multiple removal and its application by wavepath migration

作　　者：刘伊克[1] 常旭[1] 王辉[1] 卢孟夏[2] Hongchuan Sun 

机构地区：[1]中国科学院地质与地球物理研究所,中国科学院工程地质力学重点试验室,北京100029 [2]北京联合大学,北京100101 [3]Department of Geology and Geophysics,University of Utah,Utah 84112,U．S．A．

出　　处：《地球物理学报》2008年第2期589-595,共7页Chinese Journal of Geophysics

基　　金：中国科学院知识创新工程重要方向项目(KZCX2-YW-101);国家自然科学基金项目(40474021)资助

摘　　要：消除层间多次波是地震勘探资料处理研究领域的难题,尤其对于实际资料的处理,到目前为止还很难找到一种完全有效的方法.本文给出了仅对一次波成像既波路径偏移方法压制层间多次波方法,在共炮道集和共检波点道集分别计算炮点射线的入射角和检波点射线的出射角,由此计算的角度作为射线追踪的初始角度,计算地震波射线的传播路径.结合由程函方程计算的走时表,判断偏移范围是反射波还是多次波.在前期偏移过程压制多次波的理论研究基础上,本文主要研究波路径偏移消除多次波的应用部分.为了进一步说明效果的有效性,计算了在单炮和共成像点道集压制层间多次波,给出了实际资料的压制多次波的偏移结果.Internal multiple removal is a great challenge in seismic processing, and there is no successful approach to remove internal multiple. We present a method to remove internal multiple by discriminating primary reflections from multiple reflections during the migration process. Both the take-off and incidence angles are computed from the data so that rays can be traced from both the source and the receiver positions. An Eikonal equation is used for estimating the travel time table. Numerical results for a SEG/EAGE salt model show that the wavepath migration can clearly resolve the true interfaces and effectively remove multiple. Field data results show that the method can effectively remove the migration artifacts generated by internal multiples

关 键 词：层间多次波 压制多次波 波路径偏移 

分 类 号：P631[天文地球—地质矿产勘探]