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叠前深度偏移是解决复杂构造成像的重要方法 ,单炮叠前深度偏移具有最高的精度。本文针对Marmousi复杂构造模型 ,用广义相位屏法进行了单炮叠前深度偏移 ,并与裂步法和傅里叶有限差分法的偏移结果作了比较。计算用MPI并行算法实现。数值计算表明 ,广义相位屏法的精度比裂步法高 ,与傅里叶有限差分法的精度相当 ,而其计算量要小于傅里叶有限差分法。由于并行算法缩短了计算时间 ,使得该方法用于实际资料处理成为可能。
The pre-stack depth migration is an important method to solve complex structure imaging. The single-shot prestack depth migration has the highest accuracy. According to the Marmousi complex structure model, the single-shot prestack depth migration is carried out by the generalized phase-shift method, and compared with the offset results by the split-step method and the Fourier finite difference method. Computation using MPI parallel algorithm. The numerical results show that the accuracy of the generalized phase-screen method is higher than that of the split-step method, and the accuracy of the finite difference method is the same as that of the Fourier finite-difference method. However, the computational complexity of the method is smaller than that of the Fourier finite difference method. As the parallel algorithm shortens the calculation time, making the method for the actual data processing possible.