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《Chinese Journal of Geophysics》 2012-01
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Discussion about reverse-time depth migration technology of prestack elastic wavefield for offset VSP data

LI Wen-Jie,QU Shou-Li,WEI Xiu-Cheng,NING Jun-Rui Exploration & Production Research Institute,SINOPEC,Beijing 100083,China  
Offset VSP seismic data is a kind of multicomponent data,the elastic prestack reverse-time depth migration technology is no doubt the best suitable for processing offset VSP data.This paper studied prestack reverse-time depth migration algorithms based on elastic wave equation in 2D isotropic media for offset VSP data,and discussed the boundary value problems and frequency dispersion problems and their relevant solution in wavefield reverse-time propagation,then used the solution of eikonal equation to get the one-way traveltime from the source to each point in the image space,which is regarded as the image time at that point,and complemented the prestack reverse-time depth migration for offset VSP data.Finally,we carried out model test and processed offset VSP data.The processing results proved that the scheme is not influenced by lay inclination and suited to process offset VSP data from the areas with steep subsurface structures and big variation of horizontal velocities.
【Fund】: 国家高技术研究发展计划(863)(2006AA06Z203)资助
【CateGory Index】: P631.4
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