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《Chinese Journal of Geophysics》 2009-12
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Kirchhoff prestack time migration of PS-wave data for the layered anisotropic medium

HUANG Zhong-Yu~1,QU Shou-Li~1,WANG Yu-Jing~2,ZHAO Gai-Shan~2,WEI Xiu-Cheng~1,XU Yi-Ming~2,YU Bo~21 Ex ploration and Production Research Institute,SINOPEC,Beijing 100083,China2 Institute of Geophysical Prospecting,SINOPEC,Nanjing 210014,China  
The method of calculating travel times of seismic wave in Kirchhoff pre-stack time migration (PSTM) plays an important role of determining the quality of imaging for large offsets. The travel times are computed by the non-hyperbolic equation based on single layer anisotropic medium in the conventional 3D PS-wave anisotropic PSTM equations so that the events are overmigrated in common imaging point gathers (CIP) when the offset/depth ratio is greater than a threshold value.The uneven events have negative effects on migrated stack response,decrease frequency and lead to contaminating the quality of imaging.We proposed a new method to calculate travel times based on the layered anisotropic medium in PS-wave PSTM technology utilizing the migrated velocity model which was generated in the conventional 3D PS-wave anisotropic PSTM.The new method can improve the precision of travel times for the large offsets and overcome the over-migration events for a large offset/depth ratio in CIP gathers.The realistic 3D PS-wave data from two areas of West China demonstrated that the continuity and resolution of imaging section had obviously been improved by using the new PSTM comparing to conventional PS-wave PSTM and enhanced the interpretation of structures on imaging section.
【Fund】: 国家973“碳酸盐岩储积体地球物理描述”课题(2006CB202402);; 中石化科技部“三维多分量处理系统研发和多波流体预测”(P08068)项目资助.
【CateGory Index】: P631.4
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