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    基于测井曲线异构特征多视重采样的元学习岩性识别方法

    A lithology identification method based on meta-learning using multi-view resampled heterogeneous representative features from well logs

    • 摘要: 岩性识别是测井解译工作中的基础性及关键性工作之一。然而,由于不同储层性质的复杂性,井间岩性分布和测井响应规律不可避免地存在一定的不一致性,直接影响了井间岩性识别的鲁棒性。针对这一问题,提出了几种异构数据的表示方法,以揭示局部储层描述的不变性。具体来说,首先在测井数据的纵向和横向采用图来表示局部拓扑信息;然后,提取了结构张量(ST)、局部二值模式(LBP)和Hu不变矩(Hu)3种不变特征,用于鲁棒地表示测井数据局部结构信息;最后,用多视重采样策略解决原始数据域中测井曲线的取值分布不平衡和岩性重叠问题以及采用元学习方法对异构特征与目标岩性信息间的非线性关系进行建模。利用大庆油田齐家凹陷工区多口实际测井数据进行了实验,实验结果表明,所提出的不变性特征支持的异构特征多重采样元学习岩性识别方法的井间岩性识别准确率达到86%以上,体现了较强的解决井间测井曲线取值及岩性分布不一致和岩性数据不平衡问题的能力。

       

      Abstract: Lithology identification is an important foundation and critical part of well logging interpretation. However, the complexity of reservoir properties often leads to unavoidable inconsistency in cross-well lithology distribution and logging responses, impeding the robustness of cross-well lithology identification. This paper proposes several heterogeneous data representation features to reveal the invariant features of local reservoir description. Specifically, local topological information was first represented by employing graph representation technique in both vertical and lateral direction of well logging data. Then, three invariant features, namely structural tensor (ST), local binary pattern (LBP), and Hu moments (Hu), were obtained for robustly representing the local structure information of well logging data. Finally, the multi-view resampling strategy was adopted to address the distributional imbalance of log values and overlap of lithology in the original data domains, and meta-learning was employed to model the nonlinear relationship between the obtained heterogeneous features and target lithology information. Experiments were conducted using actual logging data from several wells in the Qijia depression of the Daqing Oilfield. The results indicate that the cross-well identification accuracy of the proposed method is more than 86%, proving it highly capable of solving the problems of inconsistent distribution of logging values and lithology between wells and unbalanced lithological data.

       

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