Efficient 3D wave-equation migration using virtual planar sources
Efficient 3D wave-equation migration using virtual planar sources
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DOI：
10.1190/1.2335628
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发表时间：
2006-09
期刊：
影响因子：
3.3
通讯作者：
B. Duquet;P. Lailly
中科院分区：
文献类型：
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作者：
B. Duquet;P. Lailly
全体积地震成像对于结构复杂地质的合理解释至关重要。叠前深度成像是这种成像最合适的工具，但它需要精确且通常复杂的速度模型。在这种情况下，三维克希霍夫叠前深度偏移可能是相当昂贵的。另一方面，波场方法，虽然通常非常昂贵，但不受速度模型复杂性的影响。我们提出了一个负担得起的三维波场叠前深度偏移技术。它被设计用于源-接收器方位角近似恒定的海洋勘测。该技术将平面波偏移算法应用于时移数据-当我们意识到海洋调查不允许合成真正的平面波数据时，这是一种非常令人惊讶的方法。此外，成像原理必须修改，以给出与炮点记录偏移一致的结果。我们的技术还产生图像收集，允许更新的速度模式…
Full-volume seismic imaging is essential for a sound interpretation of structurally complex geologies. Prestack depth imaging is the most appropriate tool for such imaging, but it requires a precise and often complex velocity model. In such situations, 3D Kirchhoff prestack depth migration can be quite expensive. On the other hand, a wavefield approach, although generally tremendously expensive, is not affected by the complexity of the velocity model. We propose an affordable 3-D wavefield prestack depth-migration technique. It is designed for marine surveys for which the source-receiver azimuth is approximately constant. The technique applies a plane-wave migration algorithm to time-shifted data — quite a surprising approach when we realize that marine surveys do not allow the synthesis of genuine plane-wave data. Additionally, the imaging principle has to be modified to give results consistent with shot-record migration. Our technique also produces image gathers that allow an update of the velocity mode...