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《Chinese Journal of Geophysics》 2012-01
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A high efficient super-gather migration method for 3D VSP data

CHEN Sheng-Chang1,WANG Han-Chuang1,CHEN Lin2 1 Department of Earth Sciences,Zhejiang University,Hangzhou 310027,China 2 SINOPEC Geophysical Research Institute,Nanjing 210014,China  
At present the migration of 3D VSP seismic data is implemented through the gathers one by one in common-shot-gather domain or common-receiver-gather domain,so its calculation efficiency is relatively low.Based on the special property of the shots and receivers configuration in 3D VSP survey geometry and the characteristic of linear stacking of seismic wavefield,in this paper a highly efficient migration method for 3D VSP data is proposed.It first generates one kind of super-gather by using the generalized synthesis of seismic data to the 3D VSP common-receiver gathers,and migrates the super-gather by recursively using multi-source wavefield in the depth extrapolation of common-receiver gathers,which uses one recursive depth extrapolation to implement the migration of all the common-receiver gathers.The migration tests of theoretical 3D VSP data and real 3D VSP data demonstrate that the high-efficiency super-gather migration method can get the same migration results as that of the conventional common-receiver gathers migration,and can have very high calculation efficiency,its computational amount is almost equal to that of one common-receiver gather migration.
【Fund】: 国家自然科学基金项目(41074133);; 国家高技术研究发展计划(863计划)(2007AA09Z323)资助
【CateGory Index】: P631.4
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