arXiv:2409.08602physics.geo-phcs.AI2024-09被引 7

用深度学习在震源域去混叠,提升地震数据处理效率。

Deep learning-based shot-domain seismic deblending

  • 利用未混叠数据手动混叠生成高质量训练集
  • 多通道输入加噪声预测辅助任务,提升去混叠效果
  • 适合需要快速处理大规模地震数据的团队

为加速大规模地震数据的快速处理,本文提出一种基于深度学习的震源域去混叠方法。通过利用每条测线末尾获取的未混叠震源道集作为训练数据,无需额外采集成本;通过人工混叠获得带真实标签的训练样本,完全适配实际勘测条件。采用多通道输入,包含相邻混叠震源道集,并将混叠噪声预测作为辅助任务,主任务为预测初至波事件。训练中对真值中的混叠噪声进行幅度压缩以避免过强信号干扰。现场混合采集数据测试表明,引入数据预处理策略可显著减少深层初至波泄漏。整体方法在浅层表现接近传统算法,在效率上优势明显;对大时差情况稍弱,但仍能有效去除混叠噪声。

原文摘要 · Abstract (English)

To streamline fast-track processing of large data volumes, we have developed a deep learning approach to deblend seismic data in the shot domain based on a practical strategy for generating high-quality training data along with a list of data conditioning techniques to improve performance of the data-driven model. We make use of unblended shot gathers acquired at the end of each sail line, to which the access requires no additional time or labor costs beyond the blended acquisition. By manually blending these data we obtain training data with good control of the ground truth and fully adapted to the given survey. Furthermore, we train a deep neural network using multi-channel inputs that include adjacent blended shot gathers as additional channels. The prediction of the blending noise is added in as a related and auxiliary task with the main task of the network being the prediction of the primary-source events. Blending noise in the ground truth is scaled down during the training and validation process due to its excessively strong amplitudes. As part of the process, the to-be-deblended shot gathers are aligned by the blending noise. Implementation on field blended-by-acquisition data demonstrates that introducing the suggested data conditioning steps can considerably reduce the leakage of primary-source events in the deep part of the blended section. The complete proposed approach performs almost as well as a conventional algorithm in the shallow section and shows great advantage in efficiency. It performs slightly worse for larger traveltimes, but still removes the blending noise efficiently.

地震成像深度学习去混叠

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