Low-Frequency Reconstruction for Full Waveform Inversion by Unsupervised Learning

IF 2.9 3区 地球科学 Q2 ASTRONOMY & ASTROPHYSICS
Ningcheng Ciu, Tao Lei, Wei Zhang
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Abstract

Obtaining reliable low-frequency seismic data is crucial for effectively reducing cycle-skipping in full waveform inversion. However, acquiring high signal-to-noise ratio low-frequency information from field data remains a challenge. An effective solution to mitigate cycle-skipping is to utilize low-frequency information synthesized by neural networks to obtain low-wavenumber initial models. Previous attempts to reconstruct synthetic low-frequency data using supervised learning methods have shown feasibility but were limited to training with synthetic data that required labeled information. In this study, we employed an unsupervised learning method, namely cycle-consistent adversarial networks (CycleGAN), to reconstruct large-scale-feature related low-frequency information based on the high-frequency input data. Unlike supervised learning, CycleGAN allows the use of field data as input to train the network, which is more closely aligned with practical applications. Nevertheless, this approach presents challenges in terms of training complexity and potential output stability. To overcome these challenges, we reconstructed an appropriate target data set that combines high, medium, and low-frequency components and incorporated additional loss functions to enhance the network's output performance. We conducted quantitative evaluations of the method's sensitivity to the target data set and its ability to handle low-quality input data through numerical testing. The final results from field data testing confirmed the feasibility and effectiveness of the proposed method.

Abstract Image

通过无监督学习实现全波形反演的低频重构
获取可靠的低频地震数据对于有效减少全波形反演中的周期跳跃至关重要。然而,从野外数据中获取高信噪比的低频信息仍是一项挑战。减少周期跳跃的有效解决方案是利用神经网络合成的低频信息来获取低波数初始模型。之前使用监督学习方法重建合成低频数据的尝试已显示出可行性,但仅限于使用需要标记信息的合成数据进行训练。在这项研究中,我们采用了一种无监督学习方法,即循环一致性对抗网络(CycleGAN),来根据高频输入数据重建与大尺度特征相关的低频信息。与监督学习不同,CycleGAN 允许使用现场数据作为训练网络的输入,这与实际应用更为贴近。不过,这种方法在训练复杂性和潜在输出稳定性方面存在挑战。为了克服这些挑战,我们重建了一个适当的目标数据集,将高、中、低频成分结合在一起,并加入了额外的损失函数,以提高网络的输出性能。我们通过数值测试对该方法对目标数据集的灵敏度及其处理低质量输入数据的能力进行了定量评估。实地数据测试的最终结果证实了建议方法的可行性和有效性。
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来源期刊
Earth and Space Science
Earth and Space Science Earth and Planetary Sciences-General Earth and Planetary Sciences
CiteScore
5.50
自引率
3.20%
发文量
285
审稿时长
19 weeks
期刊介绍: Marking AGU’s second new open access journal in the last 12 months, Earth and Space Science is the only journal that reflects the expansive range of science represented by AGU’s 62,000 members, including all of the Earth, planetary, and space sciences, and related fields in environmental science, geoengineering, space engineering, and biogeochemistry.
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