Investigating the Onset of Strain Localization Within Anisotropic Shale Using Digital Volume Correlation of Time-Resolved X-Ray Microtomography Images
McBeck, Jessica ; Kobchenko, Maya ; Hall, Stephen A. LU ; Tudisco, Erika LU
; Cordonnier, Benoit
; Meakin, Paul
and Renard, François
(2018)
In Journal of Geophysical Research: Solid Earth
123(9).
p.7509-7528
- Abstract
Digital volume correlation analysis of time-resolved X-ray microtomography scans acquired during in situ triaxial compression of Green River shale cores provided time series of 3-D incremental strain fields that elucidated evolving deformation processes by quantifying microscopic strain localization. With these data, we investigated the impact of mechanical anisotropy on microscopic strain localization culminating in macroscopic shear failure. We conducted triaxial compression experiments with the maximum compressive stress, σ1, aligned perpendicular and parallel to lamination planes in order to investigate end-member stress states that arise within sedimentary basins. When the preexisting laminations were perpendicular to... (More)
Digital volume correlation analysis of time-resolved X-ray microtomography scans acquired during in situ triaxial compression of Green River shale cores provided time series of 3-D incremental strain fields that elucidated evolving deformation processes by quantifying microscopic strain localization. With these data, we investigated the impact of mechanical anisotropy on microscopic strain localization culminating in macroscopic shear failure. We conducted triaxial compression experiments with the maximum compressive stress, σ1, aligned perpendicular and parallel to lamination planes in order to investigate end-member stress states that arise within sedimentary basins. When the preexisting laminations were perpendicular to σ1, a lamination-parallel region with high axial compaction developed within the macroscopically linear deformation phase of the experiment and then thickened with increasing applied differential stress. Scanning electron microscopy images indicate that this axial compaction occurred within a lower density lamination and that more axial compaction occurred within the center of the core than near its sides. Boundary element method simulations suggest that this compacting volume promoted shear fracture development within the upper portion of the shale. When the laminations were parallel to σ1, lamination-parallel dilation bands formed, thickened, and intensified in dilation. Population densities of the distributions of incremental shear strain, radial dilation, and axial contraction calculated by digital volume correlation analysis enabled quantification of the evolving overall impact of, and interplay between, these various deformation modes.
(Less)
- author
- McBeck, Jessica
; Kobchenko, Maya
; Hall, Stephen A.
LU
; Tudisco, Erika
LU
; Cordonnier, Benoit
; Meakin, Paul
and Renard, François
- organization
- publishing date
- 2018-08-31
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- digital volume correlation, fracturing, rock deformation, shale, strain localization, X-ray microtomography
- in
- Journal of Geophysical Research: Solid Earth
- volume
- 123
- issue
- 9
- pages
- 7509 - 7528
- publisher
- Wiley-Blackwell
- external identifiers
-
- scopus:85053445413
- ISSN
- 2169-9313
- DOI
- 10.1029/2018JB015676
- language
- English
- LU publication?
- yes
- id
- e9ed21d5-3460-406a-8c8b-f2c3f57a76d8
- date added to LUP
- 2018-10-24 12:12:27
- date last changed
- 2022-04-25 18:30:51
@article{e9ed21d5-3460-406a-8c8b-f2c3f57a76d8,
abstract = {{<p>Digital volume correlation analysis of time-resolved X-ray microtomography scans acquired during in situ triaxial compression of Green River shale cores provided time series of 3-D incremental strain fields that elucidated evolving deformation processes by quantifying microscopic strain localization. With these data, we investigated the impact of mechanical anisotropy on microscopic strain localization culminating in macroscopic shear failure. We conducted triaxial compression experiments with the maximum compressive stress, σ<sub>1</sub>, aligned perpendicular and parallel to lamination planes in order to investigate end-member stress states that arise within sedimentary basins. When the preexisting laminations were perpendicular to σ<sub>1</sub>, a lamination-parallel region with high axial compaction developed within the macroscopically linear deformation phase of the experiment and then thickened with increasing applied differential stress. Scanning electron microscopy images indicate that this axial compaction occurred within a lower density lamination and that more axial compaction occurred within the center of the core than near its sides. Boundary element method simulations suggest that this compacting volume promoted shear fracture development within the upper portion of the shale. When the laminations were parallel to σ<sub>1</sub>, lamination-parallel dilation bands formed, thickened, and intensified in dilation. Population densities of the distributions of incremental shear strain, radial dilation, and axial contraction calculated by digital volume correlation analysis enabled quantification of the evolving overall impact of, and interplay between, these various deformation modes.</p>}},
author = {{McBeck, Jessica and Kobchenko, Maya and Hall, Stephen A. and Tudisco, Erika and Cordonnier, Benoit and Meakin, Paul and Renard, François}},
issn = {{2169-9313}},
keywords = {{digital volume correlation; fracturing; rock deformation; shale; strain localization; X-ray microtomography}},
language = {{eng}},
month = {{08}},
number = {{9}},
pages = {{7509--7528}},
publisher = {{Wiley-Blackwell}},
series = {{Journal of Geophysical Research: Solid Earth}},
title = {{Investigating the Onset of Strain Localization Within Anisotropic Shale Using Digital Volume Correlation of Time-Resolved X-Ray Microtomography Images}},
url = {{http://dx.doi.org/10.1029/2018JB015676}},
doi = {{10.1029/2018JB015676}},
volume = {{123}},
year = {{2018}},
}