Characterizing the Influence of Fracture Density on Network Scale Transport
Characterizing the Influence of Fracture Density on Network Scale Transport
复制标题
表征裂缝密度对网络规模传输的影响
DOI:
10.1029/2019jb018547
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发表时间:
2020
期刊:
影响因子:
--
通讯作者:
Bolster, Diogo
中科院分区:
文献类型:
--
作者:
Sherman, Thomas;Hyman, Jeffrey;Dentz, Marco;Bolster, Diogo
The topology of natural fracture networks is inherently linked to the structure of the fluid velocity field and transport therein. Here we study the impact of network density on flow and transport behaviors. We stochastically generate fracture networks of varying density and simulate flow and transport with a discrete fracture network model, which fully resolves network topology at the fracture scale. We study conservative solute trajectories with Lagrangian particle tracking and find that as fracture density decreases, solute channelization to large local fractures increases, thereby reducing plume spreading. Furthermore, in sparse networks mean particle travel distance increases and local network features, such as velocity zones where flow is counter to the primary pressure gradient, become increasingly important for transport. As the network density increases, network statistics homogenize and such local features have a reduced impact. We quantify local topological influence on transport behavior with an effective tortuosity parameter, which measures the ratio of total advective distance to linear distance at the fracture scale; large tortuosity values are correlated to slow‐velocity regions. These large tortuosity, slow‐velocity regions delay downstream transport and enhance tailing on particle breakthrough curves. Finally, we predict transport with an upscaled, Bernoulli spatial Markov random walk model and parameterize local topological influences with a novel tortuosity parameter. Bernoulli model predictions improve when sampling from a tortuosity distribution, as opposed to a fixed value as has previously been done, suggesting that local network topological features must be carefully considered in upscaled modeling efforts of fracture network systems.
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影响因子:
5.4
作者:
Andrew Frampton;J. Hyman;Liangchao Zou
通讯作者:
Liangchao Zou
DOI:
--
发表时间:
2019
期刊:
Journal of Geophysical Research: Solid Earth
影响因子:
--
作者:
J. Hyman;M. Dentz;A. Hagberg;P. Kang
通讯作者:
P. Kang
DOI:
--
发表时间:
2009
期刊:
影响因子:
--
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通讯作者:
V. Cvetkovic
影响因子:
2.8
作者:
S. Joyce;L. Hartley;D. Applegate;J. Hoek;Peter Jackson
通讯作者:
Peter Jackson
DOI:
--
发表时间:
2011
期刊:
影响因子:
--
作者:
S. Ab
通讯作者:
S. Ab