通过深度归纳学习,利用稀缺标签建立钻孔岩性模型

IF 4.2 2区 地球科学 Q1 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS Computers & Geosciences Pub Date : 2024-09-02 DOI:10.1016/j.cageo.2024.105706
Jichen Wang , Jing Li , Kun Li , Zerui Li , Yu Kang , Ji Chang , Wenjun Lv
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引用次数: 0

摘要

地球物理测井是一种地质科学仪器,用于探测油井的电特性、声特性和放射性特性等信息。其数据对解释地下地质起着至关重要的作用。然而,由于测井数据是对岩石的间接反映,因此需要结合岩心样本构建测井解释模型。由于成本高昂,获取并分析一口井中的所有岩心样本并不现实,这就导致了岩心样本标签稀缺的问题。这个问题可以通过半监督学习来解决。利用测井数据进行岩性识别的现有研究大多采用基于图的半监督学习,这需要已知特征来建立图拉普拉卡矩阵。因此,这些方法通常使用特定深度的测井值来构建特征向量,无法学习测井曲线的形状信息。本文基于半监督生成对抗网络(SSGAN),提出了一种具有特征学习能力的半监督学习方法,在利用无标签测井曲线的同时,学习测井曲线的形状信息。此外,考虑到在标签极度缺乏的情况下划分验证集时标签使用不足的问题,我们提出了对三个子模型进行加权平均的策略,从而有效提高了模型性能。我们在五口井上验证了所提方法的有效性,并通过大量可视化方法展示了利用对抗学习进行半监督学习的机制。
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Borehole lithology modelling with scarce labels by deep transductive learning

Geophysical logging is a geo-scientific instrument that detects information such as electric, acoustic, and radioactive properties of a well. Its data plays a vital role in interpreting subsurface geology. However, since logging data is an indirect reflection of rocks, it requires the construction of a logging interpretation model in combination with core samples. Obtaining and analysing all core samples in a well is not practical due to their enormous cost, leading to the problem of scarce core sample labels. This problem can be addressed using semi-supervised learning. Existing studies on lithology identification using logging data mostly utilize graph-based semi-supervised learning, which requires known features to establish a graph Laplacian matrix. Therefore, these methods often use logging values at certain depths to construct feature vectors and cannot learn the shape information of logging curves. In this paper, we propose a semi-supervised learning method with feature learning capability based on semi-supervised generative adversarial network (SSGAN) to learn the shape information of logging curves while utilizing unlabelled logging curves. Additionally, considering the problem of insufficient use of labels when dividing a validation set in extremely scarce-label situations, we propose a strategy of weighted averaging of three sub-models, which effectively improves model performance. We verify the effectiveness of our proposed method on five wells and demonstrate the mechanism of semi-supervised learning using adversarial learning through extensive visualization methods.

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来源期刊
Computers & Geosciences
Computers & Geosciences 地学-地球科学综合
CiteScore
9.30
自引率
6.80%
发文量
164
审稿时长
3.4 months
期刊介绍: Computers & Geosciences publishes high impact, original research at the interface between Computer Sciences and Geosciences. Publications should apply modern computer science paradigms, whether computational or informatics-based, to address problems in the geosciences.
期刊最新文献
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