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本文提出了在τ-P域实现三维叠前深度偏移的计算方法，该方法把地震道集由时-空域变换到τ-P域，然后对共P数据体进行相移或相移加插值偏移，将偏移后的各共P数据体叠加得到叠前深度偏移结果．该算法能够实现陡倾地层的正确归位，降低偏移处理维数，减少计算机内存需求，易于并行处理，但是计算量和所花费的计算机时间仍然很大．为此我们又提出了针对目的层的分时（层）偏移方法，由于只考虑目的层，可节省大量的计算时间．文中以二维实际地震资料及三维数值模型资料的处理说明了上述方法的可行性与有效性．
In this paper, a method to calculate the 3D prestack depth migration in τ-P domain is proposed. The method transforms the seismic trace set from time-space to τ-P domain and then performs phase shift or phase shift plus interpolation on the total P data volume Offset, superimposing the shifted total P data bodies to obtain a pre-stack depth migration result. The algorithm can achieve the correct homing of steeply stratum, reduce the dimension of offset processing, reduce the demand of computer memory and easy to process in parallel, but the computation time and the computer time spent are still large. To this end, we propose a time-sharing (layer) offset method for the target layer, which can save a lot of computing time because only the target layer is considered. In this paper, the feasibility and validity of the above method are illustrated by the processing of two-dimensional real seismic data and three-dimensional numerical model data.