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《Chinese Journal of Geophysics》 2003-01
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COMMON IMAGING POINT GATHER MIGRATION VELOCITY MODELING BASED ON WAVE EQUATION

LI ZHENCHUN1 YAO YUNXIA1 MA ZAITIAN2 WANG HUAZHONG2 1 The University of Petroleum,Dongying 257061,China 2 Tongji University,Shanghai 200092,China  
The imaging result of prestack depth migration(Pre-SDM)is quite sensitive to the migration velocity field,So a reasonable migration velocity modeling is the key to obtain the Pre-SDM imaging with high quality.Firstly,common imaging point(CIP)gathers are extracted by using wave equation Pre-SDM with high imaging precision.Then,based on the perturbation method,the quantitative relationship between the errors in migration velocity and those in imaged depth is established through the parameterized velocity function and the modified residual curvature analysis(RCA).Finally,the migration velocity modeling is realized using the single/muhi parameter joint-iteration inversion.The test on Marmousi model shows that the method put forward in this paper has a stronger adaptability and better modeling and imaging results for complex geological bodies,and it is enough to only analyze and control the main reflectors through 3 to 4 iterations to meet the required precision.
【Fund】: 国家自然科学基金资助项目 (498941 90-0 2 4 ) .
【CateGory Index】: P631.4
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