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在当代石油勘探中,声测井、垂直地震剖面(VSP)以及地震勘探的联合应用与综合解释正变得日益重要。为实现综合解释,曾经在上述三种方法之间发展了若干种变换技术。然而目前还欠缺一种变换—从地面地震资料换算成VSP,即所谓的拟VSP法。本文提出了一种实现该方法的方案,它是基于在频率—波数域以递推方式将上、下行波向下延拓,并且使它们在穿越界面时互相耦合,从而求得拟VSP。用理论模型对本法进行了检验。予期用此法能够参照地震测井或声测井的层速度,把地面地震记录转化为拟垂直地震剖面。拟垂直地震剖面可能有助于资料解释,从而老井资料的潜力也将得到发挥。
In contemporary petroleum exploration, joint applications and comprehensive interpretation of acoustic logging, vertical seismic profiling (VSP) and seismic exploration are becoming increasingly important. In order to achieve a comprehensive interpretation, several transformation techniques have been developed between the above three methods. However, there is still a lack of conversion - from the ground seismic data converted to VSP, the so-called pseudo-VSP method. In this paper, a scheme to realize this method is proposed. It is based on the continuation of the up-going and down-going waves in the frequency-wavenumber domain in the recursive way, and coupling them to each other when they cross the interface to obtain the quasi VSP. This model has been tested with a theoretical model. Expected to use this method can refer to the seismic logging or acoustic logging layer velocity, the ground seismic records into quasi-vertical seismic section. Quasi-vertical seismic profiles may help to explain the data, so that the potential of the old well data will also be realized.