大多数偏移方法是以波动方程的各种单程近似为基础的,而有限差分逆时深度偏移算法并不如此。与其它的偏移算法相比,由于这种方法需要庞大的计算机设备,所以其最初应用只局限于二维资料的合成处理。因此,对于用波前相长干涉进行实际资料叠后偏移和复杂三维构造成像来说,此方法的潜力一直未能发挥出来,为了避免网格位移和数值的不稳定性, Most offset methods are based on various one-way approximations of the wave equation, whereas the finite-difference inverse-time depth migration algorithm is not. Compared with other offset algorithms, the initial application of this method is limited to the synthesis of two-dimensional data because it requires huge computer equipment. Therefore, the potential of this method has not been able to be exploited for the actual data of post-stack migration and complex three-dimensional imaging using wavefront constructive interference. In order to avoid grid displacement and numerical instability,