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《Chinese Journal of Geophysics》 2010-08
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The influence factors analyses of imaging precision in pre-stack reverse time migration

YANG Ren-Hu~(1,2),CHANG Xu~1,LIU Yi-Ke~1 1 Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China 2 Bureau of Geophysical Prospecting,Zhuozhou Hehei 072751,China  
Seismic migration is one of the most effective means to acquire subsurface structures in reflection seismic exploration.Among the migration methods in pre-stack depth domain at present,wave equation integral solutions based on ray theory and wave equation differential solutions based on one-way wave theory are widely applied in industry,which,however,both are difficult to deal with the seismic wave structure imaging problems of large lateral velocity variation and high-steep dip.In recent years,pre-stack reverse time migration developed in seismic exploration adopts the algorithm of using two-way wave method to find the differential wave motion equation solutions,which has some merits such as accurate phase,avoiding lateral variable speed and high-steep dip limitations,high imaging precision,and imaging overturned waves correctly.It makes up the imaging deficiency of the conventional seismic migration methods in industry at present.However,the imaging methods of pre-stack reverse time migration need to overcome some problems for realizing it on 3-D field data,such as raising the computational efficiency,saving data storage space,building the initial velocity model,selection of source wavelet,defining the numerical model boundary condition,and removal of artifacts et al.The problems of computational efficiency and large amount of storage will be overcome with the fast development of computer hardware and adopting some computational technologies and storage strategies.In this paper,we use a simple model to analyze the influences of the initial velocity model building,the source wavelet selection,the numerical model boundary condition definition and the artifacts removal.Especially,we propose the method of amplitude compensation filtering to remove the artifacts in propagation path caused by reflected waves.We implement the prestack reverse time migration imaging and achieve better imaging effects for the SEG/EAGE 2-D salt model and Marmousi model,and a rugged water-bottom model designed by us in this paper.
【Fund】: 国家自然科学基金项目(40830422 40874069);; 国家重点基础研究计划(973)项目(2009CB219404);; 国家科技重大专项(2008ZX05030-004-02)资助
【CateGory Index】: P631.44
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