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Quantitative evaluation of pore-scale heterogeneity based on statistical analysis of a pore network model of unconsolidated porous media
Hydrogeology Journal ( IF 2.4 ) Pub Date : 2020-05-06 , DOI: 10.1007/s10040-020-02162-6
Qi Xu , Xingwei Wang , Jiajun Chen

Heterogeneity is a common feature of aquifers and plays an important role in the efficiency of remediation of groundwater contamination. Pore-scale heterogeneity is an important control on governing mass transport and chemical/biological reactions in reactive transport processes, but quantitative characterization and systematic assessment of this property has been limited. In this study, a pore-scale-heterogeneity-synthetic index was developed to quantitatively characterize pore-scale heterogeneity of unconsolidated porous media. It was an attempt to systematically assess pore-scale heterogeneity based on statistical analysis of pore-structure characterization parameters. Pore network extraction was conducted to assist in quantifying the pore structure based on X-ray μ-CT imaging data. The quantitative characterization of pore structure provided input data for a comprehensive evaluation model. Two alternative weighting approaches—principle component analysis and the entropy method—were utilized to calculate the weight of each evaluation indicator. Based on the comprehensive evaluation results, a guideline for classification of pore-scale heterogeneity was proposed by cluster analysis. Further analysis indicated that particle size, shape, and distribution had a potential influence on pore-scale heterogeneity. The bigger, more irregular particles, as well as a wider particle-size distribution, were conducive to forming high heterogeneity at pore scale. The obtained results will provide useful information and theoretical support for pore-scale heterogeneity characterization and understanding of the pore-scale mechanisms of reactive transport processes.



中文翻译:

基于非固结多孔介质孔隙网络模型统计分析的孔隙尺度非均质性定量评价

非均质性是含水层的共同特征,并且在修复地下水污染的效率中起着重要作用。孔尺度异质性是控制反应性输运过程中的质量输运和化学/生物反应的重要控制,但是对该特性的定量表征和系统评估受到限制。在这项研究中,开发了孔隙尺度非均质性综合指数,以定量表征未固结多孔介质的孔隙尺度非均质性。这是基于对孔结构表征参数的统计分析,系统地评估孔尺度异质性的尝试。进行孔网提取以帮助基于X射线μ-CT成像数据量化孔结构。孔结构的定量表征为综合评估模型提供了输入数据。两种替代加权方法(原理成分分析和熵方法)用于计算每个评估指标的权重。在综合评价结果的基础上,提出了通过聚类分析对孔隙尺度异质性进行分类的指南。进一步的分析表明,粒径,形状和分布对孔尺度的异质性具有潜在的影响。更大,更不规则的颗粒以及更宽的粒径分布,有利于在孔尺度上形成高度的异质性。

更新日期:2020-05-06
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