层状介质时移时差研究——兼与李来林等同志商榷

作为时间推移地震的一个重要属性，时移时差已经被成功地应用于稠油热采监测。但在注水地震监测中，由于储层厚度小、油水物性差异弱、时移时差变化小等多方面原因，时移时差属性的应用相对较少。在前人研究成果的基础上，通过理论分析和模型计算详细分析了同激发点观测以及同激发点和接收点观测两种情形下叠前时移时差的变化特点，并指出了前人研究工作中存在的不足。结果表明，叠前大炮检距时移地震资料确实存在较大的时差，在条件有利的情况下，利用叠前大炮检距时移时差资料研究储层的变化是完全可能的。

Study on time-lapse seismic time difference in layered medium

Time difference, an important attribute of time lapse seismic, has been successfully used in monitoring heavy oil thermal recovery. But it has less usage in monitoring water flood recovery for a thinner reservoir thickness, a weaker difference of pore fluid, a smaller change of time difference and so on. On the basis of previous author' results, prestack time differences with the same shot point or same offset are studied by theoretical analysis and model computation. Meanwhile, the shortage existing in previous author' research is pointed out. Results show that prestack time lapse seismic data with a large offset really has a large time difference, which is surely possible to be used to research the reservoir velocity variations under favorable conditions.