Title: Permeability Evolution and Frictional Stability of Fabricated Fractures With Specified Roughness

Journal Article · · Journal of Geophysical Research. Solid Earth
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [4]
  1. Univ. of Texas, Austin, TX (United States). Inst. for Geophysics; Pennsylvania State Univ., University Park, PA (United States). EMS Energy Inst., and G3 Center; DOE/OSTI
  2. Pennsylvania State Univ., University Park, PA (United States). EMS Energy Inst., and G3 Center
  3. Pennsylvania State Univ., University Park, PA (United States). EMS Energy Inst., and G3 Center; National Inst. of Advanced Industrial Science and Technology, Koriyama (Japan). Fukushima Renewable Energy Inst.
  4. Tongji Univ., Shanghai (China)

Roughness is widely observed on natural fractures, and its impact on the potential for induced seismicity and associated fluid migration in the subsurface remains unclear. Here we perform fracture shearing and fluid flow experiments on artificially fabricated fractures with specified roughness to investigate the role of fracture roughness on frictional properties and permeability evolution. Given the experimental conditions, we observe that rough fractures show high roughness ratio S q/L w and return higher frictional strength due to the presence of cohesive interlocking asperities. Rough fracture surfaces show velocity strengthening behavior in the initial shearing stage, which may evolve to velocity neutral and velocity weakening at greater displacements—suggesting a dynamic weakening that rough fractures become less stable with shearing. The surface roughness exerts a dominant control on permeability evolution over the entire shearing history. Permeability declines monotonically by about 2 orders of magnitude for smooth fractures. For high roughness fractures, the permeabilities evolve episodically due to cycled compaction and dilation during shearing. With a slip distance of 6 to 8 mm, permeability of the rough surface may enhance up to an order of magnitude, but significant permeability reduction may also occur for rough samples when asperities are highly worn with gouge clogging flow paths. However, there is no obvious correlation between permeability evolution and frictional behavior for rough fracture samples when fractures are subject to sudden sliding velocity changes.

Research Organization:
Pennsylvania State Univ., University Park, PA (United States)
Sponsoring Organization:
USDOE Office of Fossil Energy (FE)
Grant/Contract Number:
FE0023354
OSTI ID:
1614208
Journal Information:
Journal of Geophysical Research. Solid Earth, Journal Name: Journal of Geophysical Research. Solid Earth Journal Issue: 11 Vol. 123; ISSN 2169-9313
Publisher:
American Geophysical UnionCopyright Statement
Country of Publication:
United States
Language:
English

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Permeability of Uniformly Graded 3D Printed Granular Media journal March 2021
Slip Velocity Dependence of Friction-Permeability Response of Shale Fractures journal December 2019
Cyclic Permeability Evolution During Repose Then Reactivation of Fractures and Faults journal May 2019
Collapse of Reacted Fracture Surface Decreases Permeability and Frictional Strength journal December 2019