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DOI | 10.1002/2016WR019764 |
Is the permeability of naturally fractured rocks scale dependent? | |
Azizmohammadi, Siroos1; Matthai, Stephan K.2 | |
2017-09-01 | |
发表期刊 | WATER RESOURCES RESEARCH |
ISSN | 0043-1397 |
EISSN | 1944-7973 |
出版年 | 2017 |
卷号 | 53期号:9 |
文章类型 | Article |
语种 | 英语 |
国家 | Austria; Australia |
英文摘要 | The equivalent permeability, k(eq) of stratified fractured porous rocks and its anisotropy is important for hydrocarbon reservoir engineering, groundwater hydrology, and subsurface contaminant transport. However, it is difficult to constrain this tensor property as it is strongly influenced by infrequent large fractures. Boreholes miss them and their directional sampling bias affects the collected geostatistical data. Samples taken at any scale smaller than that of interest truncate distributions and this bias leads to an incorrect characterization and property upscaling. To better understand this sampling problem, we have investigated a collection of outcrop-data-based Discrete Fracture and Matrix (DFM) models with mechanically constrained fracture aperture distributions, trying to establish a useful Representative Elementary Volume (REV). Finite-element analysis and flow-based upscaling have been used to determine k(eq) eigenvalues and anisotropy. While our results indicate a convergence toward a scale-invariant k(eq) REV with increasing sample size, k(eq) magnitude can have multi-modal distributions. REV size relates to the length of dilated fracture segments as opposed to overall fracture length. Tensor orientation and degree of anisotropy also converge with sample size. However, the REV for k(eq) anisotropy is larger than that for k(eq) magnitude. Across scales, tensor orientation varies spatially, reflecting inhomogeneity of the fracture patterns. Inhomogeneity is particularly pronounced where the ambient stress selectively activates late-as opposed to early (throughgoing) fractures. While we cannot detect any increase of k(eq) with sample size as postulated in some earlier studies, our results highlight a strong k(eq) anisotropy that influences scale dependence. |
英文关键词 | equivalent permeability permeability tensor fracured rock upscaling representative elementary volume (REV) realistic fracture aperture |
领域 | 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000413484200031 |
WOS关键词 | BRISTOL CHANNEL BASIN ; FLUID-FLOW ; POROUS-MEDIA ; HYDRAULIC CONDUCTIVITY ; NUMERICAL-SIMULATION ; FIELD DATA ; NETWORKS ; APERTURE ; JOINTS ; TENSOR |
WOS类目 | Environmental Sciences ; Limnology ; Water Resources |
WOS研究方向 | Environmental Sciences & Ecology ; Marine & Freshwater Biology ; Water Resources |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/20133 |
专题 | 资源环境科学 |
作者单位 | 1.Univ Leoben, Dept Petr Engn, Leoben, Austria; 2.Univ Melbourne, Melbourne Sch Engn, Dept Infrastruct Engn, Melbourne, Vic, Australia |
推荐引用方式 GB/T 7714 | Azizmohammadi, Siroos,Matthai, Stephan K.. Is the permeability of naturally fractured rocks scale dependent?[J]. WATER RESOURCES RESEARCH,2017,53(9). |
APA | Azizmohammadi, Siroos,&Matthai, Stephan K..(2017).Is the permeability of naturally fractured rocks scale dependent?.WATER RESOURCES RESEARCH,53(9). |
MLA | Azizmohammadi, Siroos,et al."Is the permeability of naturally fractured rocks scale dependent?".WATER RESOURCES RESEARCH 53.9(2017). |
条目包含的文件 | 条目无相关文件。 |
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