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arXiv 2408.08005cs.LG
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SG-DeepONet:源泛化深度运算学习用于全波形反演

SG-DeepONet: Source-generalized deep operator learning for full waveform inversion

Nanjing University of Aeronautics and Astronautics(南京航空航天大学);Sun Yat-sen University(中山大学)

Zekai Guo, Lihui Chai, Ye Li

AI总结:

本文提出SG-DeepONet,通过构造SVFWI数据集并设计编码器-解码器框架,提升全波形反演在不同源条件下的精度与鲁棒性。

摘要:

全波形反演(FWI)旨在从观测到的地震波场中重建地下速度模型,近年来受益于深度学习(DL)的发展。DL-based FWI的性能严重依赖于训练数据的多样性,但现有数据集如OpenFWI依赖于固定或弱变化的源条件,限制了其对真实地震场景的表示能力,阻碍了源泛化。为解决此问题,我们构建了一个新的源变量地震数据集,称为SVFWI,通过系统地改变多个表面源的频率和水平位置来构造。SVFWI进一步分为三个子集,分别建模频率变化、位置变化及其联合效应,提供了一个具有挑战性的数据驱动FWI基准。我们进一步提出了SG-DeepONet,一种针对FWI设计的新型DeepONet编码器-解码器框架。分支网络从地震观测中提取多尺度时频特征,树干网络显式嵌入源物理参数,交互式解码网络实现有效的非线性融合和高保真速度重建。在SVFWI上的大量实验表明,SG-DeepONet在变化的源条件下相比现有DL-based FWI方法实现了更优的反演精度和鲁棒性。

英文摘要:

Full waveform inversion (FWI) aims to reconstruct subsurface velocity models from observed seismic wavefields and has recently benefited from advances in deep learning (DL). The performance of DL-based FWI critically depends on the diversity of training data, yet existing datasets such as OpenFWI rely on fixed or weakly varying source conditions, limiting their ability to represent realistic seismic scenarios and hindering source generalization. To address this issue, we construct a new source-variable seismic dataset, termed SVFWI, by systematically varying the frequencies and horizontal locations of multiple surface sources. SVFWI is further divided into three subsets that respectively model frequency variations, location variations, and their combined effects, providing a challenging benchmark in data-driven FWI. We further propose SG-DeepONet, a novel DeepONet-based encoder-decoder framework tailored for FWI. The branch network extracts multi-scale time-frequency features from seismic observations, the trunk network explicitly embeds source physical parameters, and an interactive decoding network enables effective nonlinear fusion and high-fidelity velocity reconstruction. Extensive experiments on SVFWI demonstrate that SG-DeepONet achieves superior inversion accuracy and robustness under varying source conditions compared with existing DL-based FWI methods.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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