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《Oil Geophysical Prospecting》 2004-01
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Time difference of time-lapse in layered medium.

Li Lai ling,He Yu qian,Chen Ying,Mu Yong guang and Chen Xiao hong. Li Lai ling,Petroleum University,Changping District,Beijing City,102249,China  
It's difficult to directly use poststack seismic data for studying time difference of time lapse because the poststack seismic data corresponds to zero offset data and the time difference of time lapse is very small.The authors presented adopting prestack seismic data on far offset to calculate the time difference of time lapse.The order of time difference by finely calculation for multi layered theoretical model can be reached to 10 ms and above.But for a layered medium,it's difficult to compute the vertical time difference directly by using prestack data on far offset because the travelling paths of seismic wave before and after the reservoir variation are very complex and shot points and receiver points are changed.Taking a double layered medium as an example,the paper deduced and studied the time difference of layered medium,considered that using time difference of time lapse produced by large incident angle can accurately calculate the velocity difference produced by replaced reservoir fluid,which attained the goal by using 4 D seismology to monitor the reservoir.
【CateGory Index】: P631.4
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