数据驱动的原生平面波响应提取
Data-driven retrieval of primary plane-wave responses
AI总结：
本研究通过将基于卷积和互相关的数据驱动点源道集方法扩展至平面波数据集，提出了一种计算高效的原生平面波响应合成算法，用于平面波逆时偏移实现无多次波成像。
摘要：
逆时偏移提供的地震图像可能会受到与多次波偏移相关的伪影的污染。多次波会破坏地震图像，产生假阳性（即在非物理界面上聚焦能量）和假阴性（即对原生波产生破坏性干涉）。多次波预测/原生波合成方法通常设计为在点源道集上运行，因此在处理大规模问题时计算量可能很大。通过将一种基于反射响应自身卷积和互相关的数据驱动点源道集方法进行调整以引入平面波概念，推导出了一种适用于平面波数据集的计算高效方案。因此，所提出的算法允许对与平面波源响应相关的原生反射进行完全数据驱动的合成。一旦估计出原生平面波响应，它们就通过平面波逆时偏移用于无多次波成像。复杂度递增的数值测试证明了该算法仅从少量平面波数据集生成无多次波图像的潜力。
英文摘要：
Seismic images provided by reverse time migration can be contaminated by artefacts associated with the migration of multiples. Multiples can corrupt seismic images, producing both false positives, i.e. by focusing energy at unphysical interfaces, and false negatives, i.e. by destructively interfering with primaries. Multiple prediction / primary synthesis methods are usually designed to operate on point source gathers, and can therefore be computationally demanding when large problems are considered. A computationally attractive scheme that operates on plane-wave datasets is derived by adapting a data-driven point source gathers method, based on convolutions and cross-correlations of the reflection response with itself, to include plane-wave concepts. As a result, the presented algorithm allows fully data-driven synthesis of primary reflections associated with plane-wave source responses. Once primary plane-wave responses are estimated, they are used for multiple-free imaging via plane-wave reverse time migration. Numerical tests of increasing complexity demonstrate the potential of the proposed algorithm to produce multiple-free images from only a small number of plane-wave datasets.
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