Permeability and rigidity of green river shale before and after interaction with water

L. T.O. Yildirim, D. Elsworth, J. Y. Wang

Research output: Contribution to conferencePaper

Abstract

We measure acoustic travel-times in Green River shale both parallel and perpendicular to bedding to observe the effects on petrophysical properties of interactions with water (fracture fluids) for different durations. X-ray diffraction shows the samples dominantly comprise carbonate and quartz. Scanning electron microscopy shows morphology of the minerals and pore network of the shale. Horizontal and vertical helium permeability measurements are conducted to analyze permeability evolution under different stress conditions. The samples record very low permeabilities at recreated confining stresses – indicating the need to be stimulated. Permeability decreases with increasing confining stress. Permeability increases with increasing pore pressure due to gas slippage effects. Increasing effective stress generally decreases the permeability. Acoustic travel-time measurements show that compressional and shear wave velocities increase with confining stress. Shear, Young’s and bulk modulus all increase with confining stress with the more rigid samples exhibiting higher fracture conductivity. Compressional and shear wave velocities decrease as the shale is exposed to water and quartz dissolves from the pore structure, reducing moduli and acoustic velocities of the samples that exhibit lower fracture conductivity. Measured porosities suggest greater accessibility of the pores from a direction parallel to bedding.

Original languageEnglish (US)
StatePublished - Jan 1 2019
Event53rd U.S. Rock Mechanics/Geomechanics Symposium - Brooklyn, United States
Duration: Jun 23 2019Jun 26 2019

Conference

Conference53rd U.S. Rock Mechanics/Geomechanics Symposium
CountryUnited States
CityBrooklyn
Period6/23/196/26/19

Fingerprint

Shale
rigidity
Rigidity
rivers
shale
permeability
Rivers
confining
Water
porosity
river
water
Quartz
acoustics
Elastic moduli
Shear waves
interactions
Travel time
travel time
travel

All Science Journal Classification (ASJC) codes

  • Geochemistry and Petrology
  • Geophysics

Cite this

Yildirim, L. T. O., Elsworth, D., & Wang, J. Y. (2019). Permeability and rigidity of green river shale before and after interaction with water. Paper presented at 53rd U.S. Rock Mechanics/Geomechanics Symposium, Brooklyn, United States.
Yildirim, L. T.O. ; Elsworth, D. ; Wang, J. Y. / Permeability and rigidity of green river shale before and after interaction with water. Paper presented at 53rd U.S. Rock Mechanics/Geomechanics Symposium, Brooklyn, United States.
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Yildirim, LTO, Elsworth, D & Wang, JY 2019, 'Permeability and rigidity of green river shale before and after interaction with water', Paper presented at 53rd U.S. Rock Mechanics/Geomechanics Symposium, Brooklyn, United States, 6/23/19 - 6/26/19.

Permeability and rigidity of green river shale before and after interaction with water. / Yildirim, L. T.O.; Elsworth, D.; Wang, J. Y.

2019. Paper presented at 53rd U.S. Rock Mechanics/Geomechanics Symposium, Brooklyn, United States.

Research output: Contribution to conferencePaper

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AU - Wang, J. Y.

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Yildirim LTO, Elsworth D, Wang JY. Permeability and rigidity of green river shale before and after interaction with water. 2019. Paper presented at 53rd U.S. Rock Mechanics/Geomechanics Symposium, Brooklyn, United States.