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《Progress in Geophysics》 2006-04
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The study on amplitude-preserving migration

ZHANG Ping-ping~(1,2), CHANG Xu~1,GUI Zhi-rong~2(1.Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China;2.Yangtze University,Jingzhou 434023,China)  
Amplitude versus offset information is a key feature to seismic reservoir characterization.Therefore amplitude preserving migration was developed to obtain this information from seismic reflection data.In this paper we present an efficient traveltime based strategy for amplitude preserving migration of the Kirchhoff type and mainly use hyperbolic traveltime expansion method.High accuracy is achieved because second-order spatial derivatives are included in order to acknowledge the curvature of the wavefront.The migration includes the interpolation from the coarse gridded input traveltime table onto the fine migration grid,thus reducing the requirements in data storage.The interpolation is 5-6 times faster than the calculation of traveltime tables using a fast finite differences eikonal solver.On the other hand,the weight functions and geometrical spreading can be directly computed from the interpolation coefficients.It not only increase the image quality,but also reduces the need in computational time.
【Fund】: 国家自然科学基金项目(40235055)资助
【CateGory Index】: P631.4
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