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《Progress in Geophysics》 2010-02
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Pre-stack depth migration using CFP gathers

XU Xiu-gang~1,LI Zhen-chun~1,MA Shu-fang~2 (1.College of Geo-resources and Information,China University of Petroleum,Dongying 257061,China;2.PetroChina Exploration and Development Research Institute,Beijing 100083,China)  
The common-focus-point(CFP) migration technology is a kind of pre-stack seismic imaging methods based on the principle of equal traveltime,which separates Kirchhoff integral into two focusing steps (focusing on emission and focusing on detection).The method uses the time-reversed focusing operator and CFP gather to realize the prestack migration.We apply the recursive shot-record,depth migration algorithm to the CFP gathers of the seismic data and define this process as CFP-gather migration.We first get the CFP gathers and then use the theory of synthesis areal source to generate the focus source.Then based on the correlation migration we realize the pre-stack migration. Only choosing a few focusing points,we can get the migration result which is similar to the conventional common shot-records gather migration result,and improve the calculation efficiency.The experiment of the model and the process of the real data show the validity and the practicability of this method.
【Fund】: 国家863专题(2006AA06Z206);; 国家973计划(2007CB209605);; CNPC物探重点实验室中国石油大学(华东)研究室、中国石油大学(华东)研究生创新基金资助
【CateGory Index】: P631.4
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