层状介质时移时差的分析研究

英文篇名：Analysis of time-lapse seismic time difference in layered strata
中文刊名：勘探地球物理进展
英文刊名：Progress in Exploration Geophysics
作者：李来林 ; 牟永光 ; 陈小宏
英文作者：Li Lailin 1 ; 2 ; Mu Yongguang 1 ; Chen Xiaohong 1 (1. Key Lab of Geophysical Exploration under CNPC ; University of Petroleum ; Beijing 102200 ; China ; 2. Research Institute of Petroleum Exploration and Production ; Daqing Oilfield ; Daqing 163712 ; China)
中文关键词：时移地震 ; 时差 ; 层状介质
英文关键词：time lapse seismic ; time difference ; layered stratum
出版日期：2003-02-25
机构：石油大学CNPC物探重点实验室,石油大学CNPC物探重点实验室,石油大学CNPC物探重点实验室北京102200;大庆勘探开发研究院,黑龙江大庆163712 ,北京102200 ,北京102200
年：2003
期：01
出版单位：勘探地球物理进展

摘要

时移地震时差是时移地震研究的关键问题之一 ,它包含了储层的层速度差异信息 ,而层速度差异反映了储层流场的变化。由于地震勘探频率低 ,用地震资料确定时移地震的时差非常困难。目前 ,时移时差的研究基本上使用叠后资料 ,用叠前资料研究时移时差的报道还未见过。对于单层介质 ,用叠前远偏移距的时差 (可测量 )可以计算出垂直时差 ;对于层状介质 ,油藏变化前后的地震波传播路经比较复杂 ,其激发点和接受点发生了变化 ,要想用叠前远偏移距数据直接计算垂直时差比较困难。以双层介质为例 ,对层状介质的时差进行了推导和研究 ,得出了十分有价值的结论 ,对四维地震的研究将起到促进作用
Time lapse seismic time difference is very important for it shows the interval velocity difference, and the interval velocity difference depicts the changes of fluid field in strata. But it is difficult to determine time lapse seismic time difference by seismic data for its low frequency. At present, post stack seismic data is used in China for the study of time difference,the study using pre stack seismic data has not been reported. To single stratum, vertical time difference can be computed using time difference of pre stack far offset seismic data. But to layered strata, the seismic wave path is complicated when reservoir changes, and it is difficult to directly define vertical time difference by pre stack far offset seismic data. In this paper, valuable results are concluded by the study of double strata, and the conclusion is useful to the development of time lapse seismic.

引文

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