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Title: Frictional stability-permeability relationships for fractures in shales

There is wide concern that fluid injection in the subsurface, such as for the stimulation of shale reservoirs or for geological CO 2 sequestration (GCS), has the potential to induce seismicity that may change reservoir permeability due to fault slip. However, the impact of induced seismicity on fracture permeability evolution remains unclear due to the spectrum of modes of fault reactivation (e.g., stable versus unstable). As seismicity is controlled by the frictional response of fractures, we explore friction-stability-permeability relationships through the concurrent measurement of frictional and hydraulic properties of artificial fractures in Green River shale (GRS) and Opalinus shale (OPS). We observe that carbonate-rich GRS shows higher frictional strength but weak neutral frictional stability. The GRS fracture permeability declines during shearing while an increased sliding velocity reduces the rate of permeability decline. By comparison, the phyllosilicate-rich OPS has lower friction and strong stability while the fracture permeability is reduced due to the swelling behavior that dominates over the shearing induced permeability reduction. Furthermore, we conclude that the friction-stability-permeability relationship of a fracture is largely controlled by mineral composition and that shale mineral compositions with strong frictional stability may be particularly subject to permanent permeability reduction during fluid infiltration.
Authors:
ORCiD logo [1] ;  [1] ;  [1] ; ORCiD logo [2] ;  [3]
  1. Pennsylvania State Univ., University Park, PA (United States)
  2. Pennsylvania State Univ., University Park, PA (United States); Fukushima Renewable Energy Institute, Koriyama (Japan)
  3. Princeton Univ., Princeton, NJ (United States)
Publication Date:
Grant/Contract Number:
FE0023354; FG02-94ER14466; AC02-06CH11357; EAR-1128799
Type:
Accepted Manuscript
Journal Name:
Journal of Geophysical Research. Solid Earth
Additional Journal Information:
Journal Volume: 122; Journal Issue: 3; Journal ID: ISSN 2169-9313
Publisher:
American Geophysical Union
Research Org:
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
ENGLISH
Subject:
58 GEOSCIENCES; Friction; Stability; Permeability; Induced Seismicity
OSTI Identifier:
1355030
Alternate Identifier(s):
OSTI ID: 1402143

Fang, Yi, Elsworth, Derek, Wang, Chaoyi, Ishibashi, Takuya, and Fitts, Jeffrey P. Frictional stability-permeability relationships for fractures in shales. United States: N. p., Web. doi:10.1002/2016JB013435.
Fang, Yi, Elsworth, Derek, Wang, Chaoyi, Ishibashi, Takuya, & Fitts, Jeffrey P. Frictional stability-permeability relationships for fractures in shales. United States. doi:10.1002/2016JB013435.
Fang, Yi, Elsworth, Derek, Wang, Chaoyi, Ishibashi, Takuya, and Fitts, Jeffrey P. 2017. "Frictional stability-permeability relationships for fractures in shales". United States. doi:10.1002/2016JB013435. https://www.osti.gov/servlets/purl/1355030.
@article{osti_1355030,
title = {Frictional stability-permeability relationships for fractures in shales},
author = {Fang, Yi and Elsworth, Derek and Wang, Chaoyi and Ishibashi, Takuya and Fitts, Jeffrey P.},
abstractNote = {There is wide concern that fluid injection in the subsurface, such as for the stimulation of shale reservoirs or for geological CO2 sequestration (GCS), has the potential to induce seismicity that may change reservoir permeability due to fault slip. However, the impact of induced seismicity on fracture permeability evolution remains unclear due to the spectrum of modes of fault reactivation (e.g., stable versus unstable). As seismicity is controlled by the frictional response of fractures, we explore friction-stability-permeability relationships through the concurrent measurement of frictional and hydraulic properties of artificial fractures in Green River shale (GRS) and Opalinus shale (OPS). We observe that carbonate-rich GRS shows higher frictional strength but weak neutral frictional stability. The GRS fracture permeability declines during shearing while an increased sliding velocity reduces the rate of permeability decline. By comparison, the phyllosilicate-rich OPS has lower friction and strong stability while the fracture permeability is reduced due to the swelling behavior that dominates over the shearing induced permeability reduction. Furthermore, we conclude that the friction-stability-permeability relationship of a fracture is largely controlled by mineral composition and that shale mineral compositions with strong frictional stability may be particularly subject to permanent permeability reduction during fluid infiltration.},
doi = {10.1002/2016JB013435},
journal = {Journal of Geophysical Research. Solid Earth},
number = 3,
volume = 122,
place = {United States},
year = {2017},
month = {2}
}