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翻转反射波是一种来自陡界面反面反射的、向下传播经反向点然后上行为地表检波器所接收的反射波。而正反射波则指的是来自陡界面的正面反射的、直接上行的反射波。在波场向下延拓时,常规的深度偏移法往往把翻转反射波当作耗散波而忽略掉了。为了对翻转反射波也进行偏移,贝索尔(Baysal)、科斯洛夫(Kosloff)和雪尔伍德(Sherwood)提出了以双程无反射波动方程为基础的时间域逆向偏移法。克雷尔伯特最近提出了以双向外推法作为处理相同问题的另一种手段来分别偏移正反射波和翻转反射波。本文讨论克雷尔伯特的双向外推法的原理并研究一些实际算例。
Flip reflected waves are a reflection from the reverse interface of the steep interface that propagates downward through the reverse point and then up to the reflected surface wave received by the surface detector. The regular reflection wave refers to the frontal reflection reflected from the steep interface and directly reflected upward. When the wave field is extended downward, the conventional depth migration method often negates the flipped reflected wave as a dissipative wave. To offset the flipped reflected waves, Baysal, Kosloff, and Sherwood propose a time-domain reverse-migration method based on a two-way, non-reflected wave equation. Kreilbert recently proposed using bidirectional extrapolation as another means of dealing with the same problem, shifting the specular wave and the flip wave respectively. This article discusses the principle of the two-way extrapolation of Creuter and studies some practical examples.