基于波场分离的接收函数正演及偏移  

Receiver function forward modeling and migration based on wave field separation equation

作　　者：琚长辉 王伟[2] 王祥春[3] 高星[2] 

机构地区：[1]大陆碰撞与高原隆升重点实验室中国科学院青藏高原研究所,北京100101 [2]资源与环境信息系统国家重点实验室中科院地理科学与资源研究所,北京100101 [3]中国地质大学(北京)地球物理与信息技术学院,北京100083

出　　处：《地球物理学进展》2015年第6期2676-2682,共7页Progress in Geophysics

基　　金：国家自然基金项目(41130419;41240027;41374061);博士后基金(2012M510533)支持

摘　　要：针对理论接收函数的正演和偏移,本文采用基于波场分离的有限差分数值模拟的算法,借鉴成熟的地震勘探处理技术,建立了基于波场分离的一阶速度-应力方程,实现接收函数阵列的正演和偏移.利用叠前逆时偏移的理论对接收函数进行成像.数值计算的结果表明,基于波场分离理论的正演能够得到接收函数的纯P波阵列和纯S波阵列,利用叠前逆时偏移的方法能够进行高精度成像.通过对比纯P波阵列、纯S波阵列和全波场阵列的成像结果发现,利用接收函数的纯S波阵列进行叠前逆时偏移能够获得较高精度的成像结果.The separation equation of the elastic wave field using the finite-difference algorithm is applied as a solution for the forward modeling and migration of receiver function.With the help of the seismic prospecting processing technology,the one-order velocity-stress equation based on the wave field separation theory is established and the forward calculation of receiver function is implemented.The pre-stack time-reverse migration method is used for the imaging of receiver function.The result indicates that the forward modeling of P-wave and Swave component of receiver function can be calculated and the imaging can be accomplished with high accuracy employing prestack time-reverse migration.The comparison of the imaging of pure P-wave,pure S-wave and the total wave component of the receiver function shows that the imaging of pure S-wave component of receiver function can conduct to the result with the highest accuracy by the pre-stack reverse-time migration method.

关 键 词：接收函数 波场分离 有限差分正演 叠前逆时偏移 

分 类 号：P631[天文地球—地质矿产勘探]