震源逆时定位的成像条件分析  

Analysis of the imaging conditions of reverse-time location

作　　者：雷朝阳 刘怀山[2] 张茗 LEI Chao-yang;LIU Huai-shan;ZHANG Ming(Sinopec Geophysical Research Institute,Nanjing 211103,China;Key Lab of Submarine Geosciences and Prospecting Techniques,Ministry of Education,Ocean University of China,Qingdao 266100,China)

机构地区：[1]中国石油化工股份有限公司石油物探技术研究院,南京211103 [2]中国海洋大学海底科学与探测技术教育部重点实验室,青岛266100

出　　处：《地球物理学进展》2019年第6期2276-2282,共7页Progress in Geophysics

基　　金：国家自然科学基金项目(41230318);国家科技重大专项课题(2016ZX05014-001);国家科技重大专项示范任务(2016ZX05053-001)联合资助

摘　　要：震源逆时定位采用不同的成像条件可以实现自动定位,而不同成像条件的特性与应用条件是该技术值得研究的问题.本文结合波场的逆时延拓特征与成像条件的物理含义,明确了波场的逆时延拓特征是构建成像条件的基础,指出最大振幅成像条件可以同时确定震源位置与激发时间,而相关型成像条件的定位精度要高于最大振幅成像条件且有可能突破绕射极限的控制,其中多维互相关成像条件适用于稀疏检波器分布的情况.针对自相关定位剖面中浅部强振幅假象提出了改进自相关成像条件.通过不同的模型测试,验证了本文关于不同成像条件的结论及提出的改进自相关成像条件的有效性.Source reverse-time location can realize location automatically by using different imaging conditions,and the characteristics and adaptations of different imaging conditions are worth studing.In this papter,we clearly state the characteristics of wavefield reverse-time continuation is the basis of constructing imaging conditions by combining the characteristics of reverse-time continuation and the physical meaning of imaging condition.It is pointed out that the maximum amplitude imaging condition can determine the source location and excitation time simultaneously,the location accuracy of correlation-type imaging condition is higher than that of maximum amplitude imaging condition and it it possible to break through the control of diffraction limit,the multidimensional cross-correlation imaging condition is application to the sparse receive distribution.This paper proposes improved autocorrelation imaging condition against shallow strong amplitude illusion in the autocorrelation localization profile.Through different model tests,the results of different imaging conditions and the validity of improved autocorrelation imaging conditions are adequately verified.

关 键 词：逆时 相干叠加 最大振幅 自相关 多源 超分辨率 

分 类 号：P631[天文地球—地质矿产勘探]