Wavefield reconstruction by interpolating significantly decimated boundaries
Wavefield reconstruction by interpolating significantly decimated boundaries
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DOI：
10.1190/geo2015-0711.1
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发表时间：
2016-07
期刊：
影响因子：
3.3
通讯作者：
Pengliang Yang;R. Brossier;J. Virieux
中科院分区：
文献类型：
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作者：
Pengliang Yang;R. Brossier;J. Virieux
摘要许多实际地震应用，如逆时偏移（RTM）和全波形反演（FWI），通常需要大量的计算和存储。为了在RTM中进行互相关或为FWI建立梯度，必须同时访问前向波场和伴随波场。为此，有三种方法：一种是从磁盘读取存储的正向波场，第二种是通过反向传播使用最终快照和存储边界，第三种是使用检查点从存储状态重构到另一个状态。在这些技术中，反向传播的波场重建似乎是一种相当直接的方法；然而，它在3D大规模成像应用中存在严格的内存瓶颈。Courant-Friedrichs-Lewy （CFL）条件是确定时间采样以实现稳定波场外推的基本准则。边界序列在时间上的注入本质上是由奈奎斯特样本决定的。
ABSTRACTMany practical seismic applications such as reverse time migration (RTM) and full-waveform inversion (FWI) are usually computation and memory intensive. To perform crosscorrelation in RTM or build the gradient for FWI, it is mandatory to access the forward and adjoint wavefields simultaneously. To do this, there are three methods: One is to read the stored forward wavefield from the disk, the second is using the final snapshot and the stored boundaries via reverse propagation, and the third is remodeling using checkpointing from stored state to another state. Among these techniques, wavefield reconstruction by reverse propagation appears to be a quite straightforward approach; however, it suffers a stringent memory bottleneck for 3D large-scale imaging applications. The Courant-Friedrichs-Lewy (CFL) condition is a fundamental criterion to determine temporal sampling to achieve stable wavefield extrapolation. The injection of the boundary sequence in time is essentially determined by Nyquist sampli...