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Title: Hydromechanical reactivation of natural discontinuities: mesoscale experimental observations and DEM modeling

Abstract

Fracture interaction mechanisms and reactivation of natural discontinuities under fluid pressurization conditions can represent critical issues in risk assessment of caprock integrity. A field injection test, carried out in a damage fault zone at the decameter scale, i.e., mesoscale, has been studied using a distinct element model. Given the complex structural nature of the damage fault zone hydraulically loaded, the contribution of fracture sets on the bulk permeability has been investigated. It has been shown that their orientation for a given in situ stress field plays a major role. Based on these results, a simpler model with a fluid-driven fracture intersecting a second fracture has been set up to perform a sensitivity analysis. It is in presence of a minimum differential stress value with a minimum angle with the maximum principal stress that the second fracture could be both, hydraulically and mechanically reactivated. Results also showed that in the vicinity of the fluid-driven fracture, a natural fracture will offer contrasted hydromechanical responses on each side of the intersection depending on the stress conditions and its orientation with respect to the stress field. In this case, we show that a hydromechanical decoupling can occur along the same plane. These results providemore » insights into fracture-controlled permeability of fault zones depending on the properties of the fractures and their hydromechanical interactions for a given in situ stress field.« less

Authors:
 [1]; ORCiD logo [1];  [2];  [3];  [3]
  1. Univ. Savoie Mont Blanc (France)
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Earth and Environmental Science Area
  3. Jean Feger Scientific and Technical Center, Pau (France)
Publication Date:
Research Org.:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1572851
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Acta Geotechnica
Additional Journal Information:
Journal Volume: 14; Journal Issue: 5; Journal ID: ISSN 1861-1125
Publisher:
Springer
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES

Citation Formats

Tsopela, Alexandra, Donzé, Frédéric-Victor, Guglielmi, Yves, Castilla, Raymi, and Gout, Claude. Hydromechanical reactivation of natural discontinuities: mesoscale experimental observations and DEM modeling. United States: N. p., 2019. Web. doi:10.1007/s11440-019-00791-0.
Tsopela, Alexandra, Donzé, Frédéric-Victor, Guglielmi, Yves, Castilla, Raymi, & Gout, Claude. Hydromechanical reactivation of natural discontinuities: mesoscale experimental observations and DEM modeling. United States. https://doi.org/10.1007/s11440-019-00791-0
Tsopela, Alexandra, Donzé, Frédéric-Victor, Guglielmi, Yves, Castilla, Raymi, and Gout, Claude. Mon . "Hydromechanical reactivation of natural discontinuities: mesoscale experimental observations and DEM modeling". United States. https://doi.org/10.1007/s11440-019-00791-0. https://www.osti.gov/servlets/purl/1572851.
@article{osti_1572851,
title = {Hydromechanical reactivation of natural discontinuities: mesoscale experimental observations and DEM modeling},
author = {Tsopela, Alexandra and Donzé, Frédéric-Victor and Guglielmi, Yves and Castilla, Raymi and Gout, Claude},
abstractNote = {Fracture interaction mechanisms and reactivation of natural discontinuities under fluid pressurization conditions can represent critical issues in risk assessment of caprock integrity. A field injection test, carried out in a damage fault zone at the decameter scale, i.e., mesoscale, has been studied using a distinct element model. Given the complex structural nature of the damage fault zone hydraulically loaded, the contribution of fracture sets on the bulk permeability has been investigated. It has been shown that their orientation for a given in situ stress field plays a major role. Based on these results, a simpler model with a fluid-driven fracture intersecting a second fracture has been set up to perform a sensitivity analysis. It is in presence of a minimum differential stress value with a minimum angle with the maximum principal stress that the second fracture could be both, hydraulically and mechanically reactivated. Results also showed that in the vicinity of the fluid-driven fracture, a natural fracture will offer contrasted hydromechanical responses on each side of the intersection depending on the stress conditions and its orientation with respect to the stress field. In this case, we show that a hydromechanical decoupling can occur along the same plane. These results provide insights into fracture-controlled permeability of fault zones depending on the properties of the fractures and their hydromechanical interactions for a given in situ stress field.},
doi = {10.1007/s11440-019-00791-0},
journal = {Acta Geotechnica},
number = 5,
volume = 14,
place = {United States},
year = {Mon Mar 18 00:00:00 EDT 2019},
month = {Mon Mar 18 00:00:00 EDT 2019}
}

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Works referencing / citing this record:

Modeling hydraulic fracturing in jointed shale formation with the use of fully coupled discrete element method
journal, July 2019


Sensitivity of the Seismic Moment Released During Fluid Injection to Fault Hydromechanical Properties and Background Stress
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