粗糙断裂排水过程中局部孔隙异质性对侵入流体连通性的影响

IF 2.7 3区 工程技术 Q3 ENGINEERING, CHEMICAL
Tomos Phillips, Tom Bultreys, Jeroen Van Stappen, Kamaljit Singh, Sahyuo Achuo Dze, Stefanie Van Offenwert, Ben Callow, Mostafa Borji, Erik Clemens Boersheim, Vladimir Novak, Christian M. Schlepütz, Veerle Cnudde, Florian Doster, Andreas Busch
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引用次数: 0

摘要

确定单个断裂中润湿相被侵入的非润湿相(排水)置换的(非)效率,是模拟相对渗透率和毛细管压力等放大属性的关键。这些构成关系对于量化导电断裂系统对长期渗漏率的贡献(或缺乏贡献)至关重要。单个断裂尺度的建模和实验研究已经对这一过程进行了调查,然而,由于缺乏足够空间和时间分辨率的真正代表性样本的排水可视化,限制了它们的预测见解。在这里,我们使用快速同步辐射 X 射线断层扫描技术,以 1 秒的扫描时间连续捕捉 2.75 μm 的体素图像,对天然地质断裂中的排水过程进行成像。排水是在毛细管主导的条件下进行的,预计会出现渗流型模式。我们观察到这种连续连接的入侵(毛细管指状)仅在相对粗糙度 λb ≤ 0.56 的局部区域有效。这些入侵模式的分形维度分析与之前在低λb断裂和多孔介质中报道的毛细管指状模式非常吻合。由于孔径的高度异质性,连接入侵无法成为全局性的主要入侵机制,我们观察到断开入侵(断裂、碎片集群)在 λb ≥ 0.67 的局部区域普遍存在。我们的研究结果表明,相对粗糙度会影响流体的传导性,因此对流动具有重要的控制作用,从而为预测缓慢排水过程中的入侵动态提供了一个重要指标。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Influence of Local Aperture Heterogeneity on Invading Fluid Connectivity During Rough Fracture Drainage

Influence of Local Aperture Heterogeneity on Invading Fluid Connectivity During Rough Fracture Drainage

Determining the (in)efficiency of wetting phase displacement by an invading non-wetting phase (drainage) in a single fracture is key to modelling upscaled properties such as relative permeability and capillary pressure. These constitutive relationships are fundamental to quantifying the contribution, or lack thereof, of conductive fracture systems to long-term leakage rates. Single-fracture-scale modelling and experimental studies have investigated this process, however, a lack of visualization of drainage in a truly representative sample at sufficient spatial and temporal resolution limits their predictive insights. Here, we used fast synchrotron X-ray tomography to image drainage in a natural geological fracture by capturing consecutive 2.75 μm voxel images with a 1 s scan time. Drainage was conducted under capillary-dominated conditions, where percolation-type patterns are expected. We observe this continuously connected invasion (capillary fingering) only to be valid in local regions with relative roughness, λb ≤ 0.56. Fractal dimension analysis of these invasion patterns strongly aligns with capillary fingering patterns previously reported in low λb fractures and porous media. Connected invasion is prevented from being the dominant invasion mechanism globally due to high aperture heterogeneity, where we observe disconnected invasion (snap-off, fragmented clusters) to be pervasive in local regions where λb ≥ 0.67. Our results indicate that relative roughness has significant control on flow as it influences fluid conductivity and thus provides an important metric to predict invasion dynamics during slow drainage.

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来源期刊
Transport in Porous Media
Transport in Porous Media 工程技术-工程:化工
CiteScore
5.30
自引率
7.40%
发文量
155
审稿时长
4.2 months
期刊介绍: -Publishes original research on physical, chemical, and biological aspects of transport in porous media- Papers on porous media research may originate in various areas of physics, chemistry, biology, natural or materials science, and engineering (chemical, civil, agricultural, petroleum, environmental, electrical, and mechanical engineering)- Emphasizes theory, (numerical) modelling, laboratory work, and non-routine applications- Publishes work of a fundamental nature, of interest to a wide readership, that provides novel insight into porous media processes- Expanded in 2007 from 12 to 15 issues per year. Transport in Porous Media publishes original research on physical and chemical aspects of transport phenomena in rigid and deformable porous media. These phenomena, occurring in single and multiphase flow in porous domains, can be governed by extensive quantities such as mass of a fluid phase, mass of component of a phase, momentum, or energy. Moreover, porous medium deformations can be induced by the transport phenomena, by chemical and electro-chemical activities such as swelling, or by external loading through forces and displacements. These porous media phenomena may be studied by researchers from various areas of physics, chemistry, biology, natural or materials science, and engineering (chemical, civil, agricultural, petroleum, environmental, electrical, and mechanical engineering).
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