最佳单程波的传播 O.HOLBERG徐仪征译数字波场外推法是用于叠前或叠后深度偏移的一种主要算法。对于能产生可靠并可解释结果的深部成象技术来说,下覆波场外推法算法要求波能通过非均质介质传播,而且要求在传播频率和传播角度范围内只有最小化的数字感应变形。文章介绍了有限差分(FD)近似法用于空间-频率域单程波动方程的问题。常规 FD 方程式的简单归纳,即可获得计算波场向下延拓的算法和空变对称褶积算子。算子可预先计算并可绘成表格,这样,就可将瞬间频率和局部速度两者用来确定向下延拓过程中在每个网格点上的正确算子。文中设计的褶积算子目的在 The Best One Way Wave Propagation O.HOLBERG XU Yizheng The digital wavefield extrapolation method is one of the main algorithms used for prestack or poststack depth migration. For deep imaging techniques that produce reliable and interpretable results, the under-wavefield extrapolation algorithm requires wave energy to propagate through heterogeneous media and requires only minimal digital sensing within the range of propagation frequencies and propagation angles Deformation. This paper introduces the problem of finite difference (FD) approximation for one-way wave equation in space-frequency domain. The simple general FD equation can be obtained by calculating the downward continuation of the wave field algorithm and space-symmetric convolution operator. Operators can be precomputed and can be tabulated so that both instantaneous frequencies and local velocities can be used to determine the correct operator at each grid point during the downward continuation. Convolution operator designed in this paper