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arXiv 2212.04567physics.geo-phcs.LG
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在使用卷积神经网络监测CO2隔离中通过不确定性量化提高预测精度

Enhanced prediction accuracy with uncertainty quantification in monitoring CO2 sequestration using convolutional neural networks

Los Alamos National Laboratory(洛斯阿拉莫斯国家实验室);Colorado School of Mines(科罗拉多矿业学院);Michigan State University(密歇根州立大学)

Yanhua Liu, Xitong Zhang, Ilya Tsvankin, Youzuo Lin

摘要:

实时监测储层内部的变化对于CO2注入和长期储存的成功至关重要。机器学习(ML)由于其计算效率而非常适合实时CO2监测。然而,ML的大多数现有应用仅产生一个预测(即,期望),如果它相对于训练数据的分布具有偏移,则其可能不能正确地反映测试数据的分布。同时分位数回归(SQR)方法可以通过弹球损失估计神经网络目标变量的整个条件分布。在这里,我们将这种技术纳入地震反演CO2监测的目的。然后从中位数周围的特定预测区间逐像素计算不确定性图。我们还提出了一种新的数据增强方法,通过采样的不确定性,以进一步提高预测精度。所开发的方法进行测试合成Kimberlina数据,这是由能源部和基于二氧化碳捕获和封存(CCS)在加利福尼亚州的项目。结果表明,该网络可以快速估计地下速度,并具有足够的分辨率。此外,计算的不确定性量化了预测精度。即使由于现场数据采集中的问题而导致测试数据失真,该方法仍然具有鲁棒性。另一个测试表明,开发的数据增强方法在提高估计的速度场的空间分辨率和减少预测误差的有效性。

英文摘要:

Monitoring changes inside a reservoir in real time is crucial for the success of CO2 injection and long-term storage. Machine learning (ML) is well-suited for real-time CO2 monitoring because of its computational efficiency. However, most existing applications of ML yield only one prediction (i.e., the expectation) for a given input, which may not properly reflect the distribution of the testing data, if it has a shift with respect to that of the training data. The Simultaneous Quantile Regression (SQR) method can estimate the entire conditional distribution of the target variable of a neural network via pinball loss. Here, we incorporate this technique into seismic inversion for purposes of CO2 monitoring. The uncertainty map is then calculated pixel by pixel from a particular prediction interval around the median. We also propose a novel data-augmentation method by sampling the uncertainty to further improve prediction accuracy. The developed methodology is tested on synthetic Kimberlina data, which are created by the Department of Energy and based on a CO2 capture and sequestration (CCS) project in California. The results prove that the proposed network can estimate the subsurface velocity rapidly and with sufficient resolution. Furthermore, the computed uncertainty quantifies the prediction accuracy. The method remains robust even if the testing data are distorted due to problems in the field data acquisition. Another test demonstrates the effectiveness of the developed data-augmentation method in increasing the spatial resolution of the estimated velocity field and in reducing the prediction error.

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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