【摘要】 三维地震资料的处理与解释往往都需要三维正演模型给予验证，以得到准确的处理、解释结果。本文提出的三维正演方法是一种偏移算法的逆运算方法──有限差分反偏移法。这一算法具有其法简单、运算是小及深度方向分辨率高的特点，是一种快速、高精度的正演算法。反偏移法虽是偏移算法的逆运算法，却出现常规偏移算法中所没有的很多问题。为此，本文进行了三种不同反偏移方法试验，并采用了一种新的浮动坐标变换，使正演结果精度得到很大提高。实际算例也证明，反偏移法三维波动方程正演方法是一种快速、高精度的算法。更多还原

【Abstract】 The processing and interpretation of three-dimensional seismic data are usuallychecked by three-dimensional forward modeling so that satisfactory results can beobtained successfully. The three-dimensional forward modeling used here is the fi-nite difference inverse migration,the inverse operation of migration computation. Itis a fast accurate forward method because of its simplicity,small computation andhigh vertical resolution. The inverse migration involves many new problems whichordinary migration aon’t have;therefore,three inverse migration methods are testedhere. Floating coordinate transform is introduced to greatly improve forward modeling. lt is practically shown that the three-dimensional wave equation forward model-ing by inverse migration is fast and accurate.更多还原