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《Computing Techniques for Geophysical and Geochemical Exploration》 2008-06
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THE DISCUSSION OF REVERSE TIME DEPTH MIGRATION AND WAVEFIELD SEPARATION FOR PRESTACK ELASTIC DATA

LI Wen-jie,WEI Xiu-cheng,NING Jun-rui,et al.(Exploration & Production Research Institute,SINOPEC,Beijing 100083,China)  
In the paper,the scheme for scalar reverse-time depth migration of prestack ealastic seismic data by Sun and McMechan is discussed,that is,the migration of pure P-and S-waves extracted by wavefields separation during(shallow)extrapolation of the elastic data recorded at the earth' surface,and for both P-to-P and P-to-S converted reflected waves,the imaging time at each point is the P-wave traveltime from the source to that point.the extracted P-wave is reverse-time extrapolated and imaged with a P-velocity model using a finite difference solution of the scalar wave equation,the extracted S-wave is reverse-time extrapolated and imaged similarly,but with an S-velocity model,and converted S-wave data requires a polarity correction prior to migration to ensure constructive interference between data from adjacent source.Then,on the basis of imaging scheme offered by Sun and McMechan,a new imaging scheme called direct migration and imaging was offered,which implemented wavefields separation and imaging and converted S-wave's polarity correction for those points satisfying imaging condition during extrapolation of the elastic data recorded at the earth' surface with entire velocity model.Finally,the results obtained with the two imaging schemes were compared.
【Fund】: 国家“863”科技攻关项目(2006AA06Z203)
【CateGory Index】: P631.412
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