Can mineralogical compositions predict frictional strength, stability and shear permeability of fractures?

Yi Fang, Derek Elsworth, Chaoyi Wang, Yunzhong Jia

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

Massive fluid injection can reactivate pre-existing faults or fractures and induce deformation as either seismic slip, slow slip or aseismic slip. These shear deformations, controlled by frictional strength and stability, may lead to different shear permeability evolutions. Previous studies have explored frictional stability-permeability relationships of carbonate-rich and phyllosilicate-rich samples during shear deformation, suggesting that phyllosilicate-rich shale has a lower frictional strength, but higher frictional stability and larger permeability reduction than that of carbonate-rich shale. This qualitative result is sufficient to identify the role of individual mineral group (i.e., tectosilicate, carbonate, and phyllosilicate) in prompting this response. Indeed, it is still uncertain whether or not a quantitative relationship of frictional stability-permeability relationships of fractures exists. In this study, we perform a series of hydroshearing experiments on saw-cut fractures of natural rocks (Green River shale, Opalinus shale, Longmaxi shale, Tournemire shale, Marcellus shale, and Newberry tuff) with distinct mineralogical compositions to understand the frictional stability-permeability relationships with respect to individual mineral groups. Our experimental results indicate that permeability change increases non-linearly with frictional strength while decreases non-linearly with frictional stability. These relationships imply that clay-rich fractures may be easily reactivated with aseismic deformation due to low frictional strength and high frictional stability, meanwhile, the permeability may decline due to clay swelling and wear product compaction. On the contrary, tectosilicate-rich fractures show the opposite trend. These results are significant for providing valuable references for understanding how permeability evolves in engineering activities like shale reservoir stimulation and CO2 caprock integrity evaluation.

Original languageEnglish (US)
Title of host publication51st US Rock Mechanics / Geomechanics Symposium 2017
PublisherAmerican Rock Mechanics Association (ARMA)
Pages1027-1035
Number of pages9
ISBN (Electronic)9781510857582
StatePublished - Jan 1 2017
Event51st US Rock Mechanics / Geomechanics Symposium 2017 - San Francisco, United States
Duration: Jun 25 2017Jun 28 2017

Publication series

Name51st US Rock Mechanics / Geomechanics Symposium 2017
Volume2

Other

Other51st US Rock Mechanics / Geomechanics Symposium 2017
CountryUnited States
CitySan Francisco
Period6/25/176/28/17

Fingerprint

Shale
shale
permeability
shear
Chemical analysis
Carbonates
phyllosilicate
tectosilicate
carbonates
slip
carbonate
Shear deformation
clays
Minerals
minerals
fluid injection
clay
mineral
high strength
stimulation

All Science Journal Classification (ASJC) codes

  • Geochemistry and Petrology
  • Geophysics

Cite this

Fang, Y., Elsworth, D., Wang, C., & Jia, Y. (2017). Can mineralogical compositions predict frictional strength, stability and shear permeability of fractures? In 51st US Rock Mechanics / Geomechanics Symposium 2017 (pp. 1027-1035). (51st US Rock Mechanics / Geomechanics Symposium 2017; Vol. 2). American Rock Mechanics Association (ARMA).
Fang, Yi ; Elsworth, Derek ; Wang, Chaoyi ; Jia, Yunzhong. / Can mineralogical compositions predict frictional strength, stability and shear permeability of fractures?. 51st US Rock Mechanics / Geomechanics Symposium 2017. American Rock Mechanics Association (ARMA), 2017. pp. 1027-1035 (51st US Rock Mechanics / Geomechanics Symposium 2017).
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Fang, Y, Elsworth, D, Wang, C & Jia, Y 2017, Can mineralogical compositions predict frictional strength, stability and shear permeability of fractures? in 51st US Rock Mechanics / Geomechanics Symposium 2017. 51st US Rock Mechanics / Geomechanics Symposium 2017, vol. 2, American Rock Mechanics Association (ARMA), pp. 1027-1035, 51st US Rock Mechanics / Geomechanics Symposium 2017, San Francisco, United States, 6/25/17.

Can mineralogical compositions predict frictional strength, stability and shear permeability of fractures? / Fang, Yi; Elsworth, Derek; Wang, Chaoyi; Jia, Yunzhong.

51st US Rock Mechanics / Geomechanics Symposium 2017. American Rock Mechanics Association (ARMA), 2017. p. 1027-1035 (51st US Rock Mechanics / Geomechanics Symposium 2017; Vol. 2).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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AU - Jia, Yunzhong

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N2 - Massive fluid injection can reactivate pre-existing faults or fractures and induce deformation as either seismic slip, slow slip or aseismic slip. These shear deformations, controlled by frictional strength and stability, may lead to different shear permeability evolutions. Previous studies have explored frictional stability-permeability relationships of carbonate-rich and phyllosilicate-rich samples during shear deformation, suggesting that phyllosilicate-rich shale has a lower frictional strength, but higher frictional stability and larger permeability reduction than that of carbonate-rich shale. This qualitative result is sufficient to identify the role of individual mineral group (i.e., tectosilicate, carbonate, and phyllosilicate) in prompting this response. Indeed, it is still uncertain whether or not a quantitative relationship of frictional stability-permeability relationships of fractures exists. In this study, we perform a series of hydroshearing experiments on saw-cut fractures of natural rocks (Green River shale, Opalinus shale, Longmaxi shale, Tournemire shale, Marcellus shale, and Newberry tuff) with distinct mineralogical compositions to understand the frictional stability-permeability relationships with respect to individual mineral groups. Our experimental results indicate that permeability change increases non-linearly with frictional strength while decreases non-linearly with frictional stability. These relationships imply that clay-rich fractures may be easily reactivated with aseismic deformation due to low frictional strength and high frictional stability, meanwhile, the permeability may decline due to clay swelling and wear product compaction. On the contrary, tectosilicate-rich fractures show the opposite trend. These results are significant for providing valuable references for understanding how permeability evolves in engineering activities like shale reservoir stimulation and CO2 caprock integrity evaluation.

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M3 - Conference contribution

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Fang Y, Elsworth D, Wang C, Jia Y. Can mineralogical compositions predict frictional strength, stability and shear permeability of fractures? In 51st US Rock Mechanics / Geomechanics Symposium 2017. American Rock Mechanics Association (ARMA). 2017. p. 1027-1035. (51st US Rock Mechanics / Geomechanics Symposium 2017).