arXiv:2603.16393math.NAcs.AI2026-03被引 1

用物理模型引导扩散过程,提升地震反演的精度与鲁棒性。

Robust Physics-Guided Diffusion for Full-Waveform Inversion

  • 结合评分生成先验与波方程模拟似然,实现物理约束下的图像生成。
  • 在OpenFWI数据集上,重建质量优于传统优化方法和标准扩散采样。
  • 适合地震成像、逆问题求解等需要高精度物理建模的领域使用。

我们提出一种鲁棒的物理引导扩散框架用于全波形反演,将基于评分的生成先验与通过波方程模拟计算的似然引导相结合。采用基于传输的数据一致性势能(Wasserstein-2),引入有界加权和观测依赖归一化来增强波场,从而提升对振幅失衡及时间/相位错位的鲁棒性。在推理端,设计了一种预条件引导反向扩散方案,动态调整引导强度与空间尺度,使数据一致性引导步骤比标准扩散后验采样(DPS)更稳定高效。在OpenFWI数据集上的数值实验表明,在相当计算开销下,该方法的重建质量优于确定性优化基线和标准DPS。

原文摘要 · Abstract (English)

We develop a robust physics-guided diffusion framework for full-waveform inversion that combines a score-based generative prior with likelihood guidance computed through wave-equation simulations. We adopt a transport-based data-consistency potential (Wasserstein-2), incorporating wavefield enhancement via bounded weighting and observation-dependent normalization, thereby improving robustness to amplitude imbalance and time/phase misalignment. On the inference side, we introduce a preconditioned guided reverse-diffusion scheme that adapts the guidance strength and spatial scaling throughout the reverse-time dynamics, yielding a more stable and effective data-consistency guidance step than standard diffusion posterior sampling (DPS). Numerical experiments on OpenFWI datasets demonstrate improved reconstruction quality over deterministic optimization baselines and standard DPS under comparable computational budgets.

地震反演扩散模型物理引导逆问题

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