Deep learning-based seismic lithofacies prediction in sparse well areas via geology-informed pseudo-well construction and transfer learning

IF 2.1 3区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY
Jinyu Meng , Luanxiao Zhao , Minghui Xu , Hua Chen
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引用次数: 0

Abstract

Accurate lithology prediction from seismic data plays a critical role in unraveling the complexities of subsurface geology, enabling informed decision-making in geo-energy exploration and production, geological storage of CO2, and geological hazard assessment. Deep learning approaches, with their capabilities of feature extraction, mapping non-linear relationships, and handling high dimensional features, show great potential in seismic reservoir characterization. However, limited well logging data due to high drilling costs pose challenges for deep learning model training, particularly in frontier exploration and early development stage. Existing data augmentation methods often focus on increasing data quantity without effectively utilizing geological knowledge, potentially limiting their ability to capture the realistic complexity of data. To address this challenge, especially in sparse well regions, we propose a geostatistics-based pseudo-well construction methodology. By considering geologic stratification, the lithofacies are simulated using the Markov chain method, and the corresponding elastic features are simulated using sequential Gaussian simulation. This methodology enhances the reliability and accuracy of pseudo-well construction, with more geological consistency with the actual wells. Then, using the limited actual well data, we use transfer learning strategy to predict lithofacies from prestack data and seismic inversion via supervised convolutional neural network. We employ the proposed methodology in a coal-bearing clastic reservoir. Based on the blind well test, the strategy of combining pseudo-well data and transfer learning leads to a notable enhancement in the F1 score of sandstone from 57.45 % to 62.16 %, as well as an overall F1 score improvement from 52.92 % to 57.89 %. We apply this method to 2D seismic profiles (prestack data and inversion results), and the predicted spatial distribution of the lithofacies shows better agreement with the lithofacies in actual wells and more geological reasonableness.
基于地质信息拟井和迁移学习的稀疏井区地震岩相深度学习预测
根据地震数据进行精确的岩性预测,对于揭示地下地质的复杂性、在地能源勘探和生产、二氧化碳的地质储存和地质灾害评估中做出明智的决策至关重要。深度学习方法具有特征提取、映射非线性关系和处理高维特征的能力,在地震储层表征中显示出巨大的潜力。然而,由于钻井成本高,测井数据有限,这给深度学习模型的训练带来了挑战,特别是在前沿勘探和早期开发阶段。现有的数据增强方法往往侧重于增加数据量,而没有有效地利用地质知识,这可能限制了它们捕捉数据实际复杂性的能力。为了解决这一挑战,特别是在稀疏井区,我们提出了一种基于地质统计学的伪井建造方法。在考虑地质分层的情况下,采用马尔可夫链方法模拟岩相,采用序贯高斯模拟方法模拟相应的弹性特征。该方法提高了拟井施工的可靠性和准确性,与实际井具有更强的地质一致性。然后,利用有限的实际井数据,采用迁移学习策略,通过监督卷积神经网络从叠前数据和地震反演中预测岩相。我们在含煤碎屑储层中应用了所提出的方法。在盲试井的基础上,采用伪井数据与迁移学习相结合的策略,砂岩的F1分数由57.45%提高到62.16%,整体F1分数由52.92%提高到57.89%。将该方法应用于二维地震剖面(叠前数据和反演结果),预测的岩相空间分布与实际井岩相吻合较好,地质合理性更强。
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来源期刊
Journal of Applied Geophysics
Journal of Applied Geophysics 地学-地球科学综合
CiteScore
3.60
自引率
10.00%
发文量
274
审稿时长
4 months
期刊介绍: The Journal of Applied Geophysics with its key objective of responding to pertinent and timely needs, places particular emphasis on methodological developments and innovative applications of geophysical techniques for addressing environmental, engineering, and hydrological problems. Related topical research in exploration geophysics and in soil and rock physics is also covered by the Journal of Applied Geophysics.
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