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本文用波动方程反时偏移法实现了变速介质中VSP资料的波动方程偏移归位.方法的优点是:1)不需要对VSP资料作上、下行波分离和动校正处理,就可直接用VSP资料进行反时延拓成象;2)适用于变速介质和任意倾角;3)本方法既可用于井中共炮点地震资料偏移,也可用于地表共炮点地震记录的偏移。最后给出的二维理论试算结果表明,若对多个偏移距VSP资料作偏移处理后,再实现真共反射点迭加,则可得到更好的偏移成象结果。
In this paper, the wave equation of VSP data in variable speed medium is migrated by anti-time migration method of wave equations, and the method has the following advantages: 1) The VSP data can be directly and directly Time-varying continuation imaging with VSP data; 2) Suitable for variable speed media and arbitrary dip; 3) This method can be used for offsetting seismic data of common shots in wells and also for offsetting seismic records of surface common shots. Finally, the experimental results of two-dimensional theory show that if more than one offset VSP data is processed for offset and then the true common-reflection point is added, a better offset imaging result can be obtained.