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Title: Effect of mineralogy on friction-dilation relationships for simulated faults: Implications for permeability evolution in caprock faults

Journal Article · · Geoscience Frontiers

This paper experimentally explores the frictional sliding behavior of two simulated gouges: one, a series ofquartz–smectite mixtures, and the other, powdered natural rocks, aiming to evaluate and codify the effect ofmineralogy on gouge dilation and frictional strength, stability, and healing. Specifically, velocity-stepping andslide-hold-slide experiments were performed in a double direct shear configuration to analyze frictional consti-tutive parameters at room temperature, under normal stresses of 10, 20, and 40 MPa. Gouge dilation wasmeasured based on the applied step-wise changes in shear velocity. The frictional response of the quartz–smectitemixtures and powdered natural rocks are affected by their phyllosilicate content. Frictional strength and healingrates decrease with increasing phyllosilicate content, and at 20 wt.% a transition from velocity-weakening tovelocity-strengthening behavior was noted. For both suites of gouges, dilation is positively correlated with fric-tional strength and healing rates, and negatively correlated with frictional stability. Changes in the permeabilityof gouge-filled faults were estimated from changes in mean porosity, indexed through measured magnitudes ofgouge dilation. This combined analysis implies that the reactivation of caprock faultsfilled with phyllosilicate-rich gouges may have a strong influence on permeability evolution in caprock faults.

Research Organization:
Pennsylvania State Univ., University Park, PA (United States)
Sponsoring Organization:
USDOE Office of Fossil Energy (FE)
Grant/Contract Number:
FE0023354
OSTI ID:
1567973
Alternate ID(s):
OSTI ID: 1799770
Journal Information:
Geoscience Frontiers, Journal Name: Geoscience Frontiers Vol. 11 Journal Issue: 2; ISSN 1674-9871
Publisher:
ElsevierCopyright Statement
Country of Publication:
Netherlands
Language:
English
Citation Metrics:
Cited by: 35 works
Citation information provided by
Web of Science

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