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Title: Stress-Induced Anomalous Transport in Natural Fracture Networks

Abstract

In this work we investigate the effects of geological stress on fluid flow and tracer transport in natural fracture networks. We show the emergence of non-Fickian (anomalous) transport from the interplay among fracture network geometry, aperture heterogeneity, and geological stress. In this study, we extract the fracture network geometry from the geological map of an actual rock outcrop, and we simulate the geomechanical behavior of fractured rock using a hybrid finite-discrete element method. We analyze the impact of stress on the aperture distribution, fluid flow field, and tracer transport properties. Both stress magnitude and orientation have strong effects on the fracture aperture field, which in turn affects fluid flow and tracer transport through the system. We observe that stress anisotropy may cause significant shear dilation along long, curved fractures that are preferentially oriented to the stress loading. This, in turn, induces preferential flow paths and anomalous early arrival of tracers. An increase in stress magnitude enhances aperture heterogeneity by introducing more small apertures, which exacerbates late-time tailing. This effect is stronger when there is higher heterogeneity in the initial aperture field. To honor the flow field with strong preferential flow paths, we extend the Bernoulli Continuous Time Random Walk modelmore » to incorporate dual velocity correlation length scales. The proposed upscaled transport model captures anomalous transport through stressed fracture networks and agrees quantitatively with the high-fidelity numerical simulations.« less

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [4]
  1. Univ. of Minnesota, Twin Cities, MN (United States)
  2. ETH Zurich (Switzerland)
  3. Spanish National Research Council (CSIC), Barcelona (Spain). Inst. of Environmental Assessment and Water Research (IDAEA)
  4. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Publication Date:
Research Org.:
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Sponsoring Org.:
USDOE Office of Science (SC); George and Orpha Gibson Endowment; Korea Ministry of Environment (MOE); European Research Council (ERC)
OSTI Identifier:
1612957
Alternate Identifier(s):
OSTI ID: 1515113
Grant/Contract Number:  
SC0018357; W12530(2018002440003)
Resource Type:
Accepted Manuscript
Journal Name:
Water Resources Research
Additional Journal Information:
Journal Volume: 55; Journal Issue: 5; Journal ID: ISSN 0043-1397
Publisher:
American Geophysical Union (AGU)
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; 58 GEOSCIENCES; Environmental Sciences & Ecology; Marine & Freshwater Biology; Water Resources

Citation Formats

Kang, Peter K., Lei, Qinghua, Dentz, Marco, and Juanes, Ruben. Stress-Induced Anomalous Transport in Natural Fracture Networks. United States: N. p., 2019. Web. doi:10.1029/2019wr024944.
Kang, Peter K., Lei, Qinghua, Dentz, Marco, & Juanes, Ruben. Stress-Induced Anomalous Transport in Natural Fracture Networks. United States. https://doi.org/10.1029/2019wr024944
Kang, Peter K., Lei, Qinghua, Dentz, Marco, and Juanes, Ruben. Wed . "Stress-Induced Anomalous Transport in Natural Fracture Networks". United States. https://doi.org/10.1029/2019wr024944. https://www.osti.gov/servlets/purl/1612957.
@article{osti_1612957,
title = {Stress-Induced Anomalous Transport in Natural Fracture Networks},
author = {Kang, Peter K. and Lei, Qinghua and Dentz, Marco and Juanes, Ruben},
abstractNote = {In this work we investigate the effects of geological stress on fluid flow and tracer transport in natural fracture networks. We show the emergence of non-Fickian (anomalous) transport from the interplay among fracture network geometry, aperture heterogeneity, and geological stress. In this study, we extract the fracture network geometry from the geological map of an actual rock outcrop, and we simulate the geomechanical behavior of fractured rock using a hybrid finite-discrete element method. We analyze the impact of stress on the aperture distribution, fluid flow field, and tracer transport properties. Both stress magnitude and orientation have strong effects on the fracture aperture field, which in turn affects fluid flow and tracer transport through the system. We observe that stress anisotropy may cause significant shear dilation along long, curved fractures that are preferentially oriented to the stress loading. This, in turn, induces preferential flow paths and anomalous early arrival of tracers. An increase in stress magnitude enhances aperture heterogeneity by introducing more small apertures, which exacerbates late-time tailing. This effect is stronger when there is higher heterogeneity in the initial aperture field. To honor the flow field with strong preferential flow paths, we extend the Bernoulli Continuous Time Random Walk model to incorporate dual velocity correlation length scales. The proposed upscaled transport model captures anomalous transport through stressed fracture networks and agrees quantitatively with the high-fidelity numerical simulations.},
doi = {10.1029/2019wr024944},
journal = {Water Resources Research},
number = 5,
volume = 55,
place = {United States},
year = {Wed Apr 17 00:00:00 EDT 2019},
month = {Wed Apr 17 00:00:00 EDT 2019}
}

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Works referencing / citing this record:

The Role of In Situ Stress in Organizing Flow Pathways in Natural Fracture Networks at the Percolation Threshold
journal, December 2019