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《Chinese Journal of Geophysics》 2014-08
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One-way wave equation least-squares migration based on illumination compensation

ZHOU Hua-Min;CHEN Sheng-Chang;REN Hao-Ran;WANG Han-Chuang;CHEN Guo-Xin;Department of Earth Sciences,Zhejiang University;  
Least-squares migration is a linear seismic inversion method which is established based on the linear relationship between seismic reflection data and underground reflection.Compared with conventional imaging technique,it has better performance in preserving amplitude.This paper presents a one-way wave equation least-squares migration based on illumination compensation.Firstly,we use the stable Born approximation generalized screen one-way wavefield propagator to construct the linear operator between reflected seismic data and underground reflection.Then we use the linear optimization method to solve the linear inverse problem of the least-squares migration.In the process of solving the optimization problems iteratively,we use the seismic wave illumination as a preconditioned operator of the iterative inversion,so as to accelerate the convergence speed of iteration.During the one-way wave propagation,we consider the transmission effect arising from velocity interface,and substitute monopole source for dipole source in conventional migration.Applying the method proposed in this paper to the layered theoretical model and the Marmosi model has achieved ideal results.
【Fund】: 国家自然科学基金项目(41074133 41304089 41374001);; 中国石化地球物理重点实验室开放基金项目资助
【CateGory Index】: P631.4
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