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Title: Mineralogical Controls on Frictional Strength, Stability, and Shear Permeability Evolution of Fractures

Journal Article · · Journal of Geophysical Research. Solid Earth
DOI:https://doi.org/10.1029/2017jb015338· OSTI ID:1539725
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [2];  [3]
  1. Pennsylvania State Univ., University Park, PA (United States); Univ. of Texas, Austin, TX (United States)
  2. Pennsylvania State Univ., University Park, PA (United States)
  3. Pennsylvania State Univ., University Park, PA (United States); Chongqing Univ. (China)

Abstract Massive fluid injection into the subsurface can induce microearthquakes by reactivating preexisting faults or fractures as seismic or aseismic slip. Such seismic or aseismic shear deformations may result in different modes of permeability evolution. Previous experimental studies have explored frictional stability‐permeability relationships of carbonate‐rich and phyllosilicate‐rich samples under shear, suggesting that friction‐permeability relationship may be primarily controlled by fracture minerals. We examine this relationship and identify the role of mineralogy (i.e., tectosilicate, carbonate, and phyllosilicate content) using direct‐shear experiments on smooth saw‐cut fractures of natural rocks and sintered fractures with distinct mineralogical compositions. These results indicate that the friction‐permeability relationship is controlled by mineralogy. Frictional strength and permeability change upon reactivation decrease with phyllosilicate content but increase with tectosilicate content. In contrast, the reverse trend is observed for frictional stability ( a ‐ b ). However, the permeability change decreases with carbonate content while both frictional strength and stability increase. The permeability change always decreases with an increase in frictional stability. This relationship implies a new mechanical‐hydro‐chemical coupling loop via a linkage of frictional properties, mineralogy, and permeability.

Research Organization:
Pennsylvania State Univ., University Park, PA (United States)
Sponsoring Organization:
USDOE Office of Fossil Energy (FE)
Grant/Contract Number:
FE0023354; DE‐FE0023354
OSTI ID:
1539725
Alternate ID(s):
OSTI ID: 1438057
Journal Information:
Journal of Geophysical Research. Solid Earth, Vol. 123, Issue 5; ISSN 2169-9313
Publisher:
American Geophysical UnionCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 37 works
Citation information provided by
Web of Science

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Cited By (4)

Chemo-mechanical behavior of clay-rich fault gouges affected by CO 2 -brine-rock interactions : Original Research Article: Chemo-mechanical behavior of clay-rich fault gouges journal December 2018
Slip Velocity Dependence of Friction-Permeability Response of Shale Fractures journal December 2019
Ensemble Shear Strength, Stability, and Permeability of Mixed Mineralogy Fault Gouge Recovered From 3D Granular Models journal January 2019
Collapse of Reacted Fracture Surface Decreases Permeability and Frictional Strength journal December 2019

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