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《Chinese Journal of Geophysics》 2018-03
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Optimized imaging schemes of PS-wave Kirchhoff prestack time migration

YUE YuBo;LI ZhenChun;QIAN ZhongPing;SUN PengYuan;YANG XueLin;XUE GuiRen;R&D Center,BGP,CNPC;School of Geosciences,China University of Petroleum;  
PS-wave Kirchhoff time migration is a crucial step in the processing flow of converted wave data.However,because of the different propagation velocities and mechanisms of downinggoing P-waves and up-going S-waves,its implementation is quite different from that of PP-wave Kirchhoff migration.In this paper,we discuss several important technical issues of PS-wave Kirchhoff time migration in a VTI medium.First,we derive a simplified PS-wave migration amplitude weight based on constant velocities,which can both ensure computation efficiency and amplitude accuracy.Secondly,we derive the maximum aliasing-free frequency formula based on straight ray assumption to filter operator aliasing.Then,we choose an optimized migration aperture which is symmetrical with common conversion points so as to save computational expense and reduce migration noise.In addition,in order to eliminate the influence of nonsmoothness caused by the traditional linear interpolation method,we propose to use the cubic convolution interpolation method to calculate the parameters at fine image grids.Tests on real datasets demonstrate the validity of our methods.
【Fund】: 国家科技重大专项(2017ZX05018005-002);; 中国石油天然气集团公司科学研究与技术开发项目(2016E-1005);; 中国科协青年人才托举工程(2016QNRC001)联合资助
【CateGory Index】: P631.4
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Chinese Journal Full-text Database 5 Hits
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