Mineralogy-controlled friction, stability and dilation properties for major reservoir rocks in China

M. An, F. Zhang, D. Elsworth

Research output: Contribution to conferencePaper

Abstract

To probe mechanisms of the controls of mineral composition on fault friction, stability and dilation properties during reservoir stimulation, simulated fault gouges comprising powdered samples of major reservoir rocks in China were sheared in double direct shear configuration under water-saturated conditions at room temperature. The samples span a range of phyllosilicate contents from 0 to 30 wt.% and with grain sizes <150 μm. Velocity-stepping tests were performed to assess the key friction parameters at three different normal stresses. Experimental results show that the phyllosilicate minerals have a strong influence on gouge friction, stability and dilation properties. The friction coefficient decreases monotonically with increasing phyllosilicate contents and the frictional stability parameter (a - b) increases with an increase in phyllosilicate content with a transition from velocity weakening to velocity strengthening behavior at 15 wt.% phyllosilicate content. Gouge dilation is observed upon a change in shearing velocity and may be used as a proxy for permeability evolution in gouge-filled faults. The dilation scales positively with friction coefficient and negatively with frictional stability parameter (a - b). The above results provide insight in understanding the potential for induced seismicity and permeability evolution during reservoir stimulation.

Original languageEnglish (US)
StatePublished - Jan 1 2020
EventARMA-CUPB Geothermal International Conference 2019 - Beijing, China
Duration: Aug 5 2019Aug 8 2019

Conference

ConferenceARMA-CUPB Geothermal International Conference 2019
CountryChina
CityBeijing
Period8/5/198/8/19

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All Science Journal Classification (ASJC) codes

  • Geotechnical Engineering and Engineering Geology
  • Economic Geology
  • Renewable Energy, Sustainability and the Environment

Cite this

An, M., Zhang, F., & Elsworth, D. (2020). Mineralogy-controlled friction, stability and dilation properties for major reservoir rocks in China. Paper presented at ARMA-CUPB Geothermal International Conference 2019, Beijing, China.