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@inproceedings{Wenning:2021,
author = {Wenning, QC and Madonna, C and Petrini, C and Giardini, D and Kurotori, T and Hwang, J and Pini, R and Zappone, A and Wiemer, S},
title = {X-ray CT imaging of displacement-and swelling-induced fracture aperture changes in clay-rich rock},
year = {2021}
}

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TY  - CPAPER
AB  - The study of permeability in fracture shale is challenging because coupled processes of mechanical damage, flow, and self-sealing are largely affected by the abundance of clay mineral in such systems. Yet the understanding of the coupling of these processes is fundamental to successful implementation of subsurface energy and waste storage technologies. Here, we present experimental results that combine simultaneous X-ray Computed Tomography with shear-flow experiments to study fracture deformation, fluid sorption, and flow in shale. In both experiments, the average mechanical aperture increases with shear displacement under constant radial stress (1.5 MPa). Upon subsequent brine injection the aperture is reduced to below the initial mated state. Digital image correlation is used to quantify the divergent displacement of the two sample halves, which is likely caused by fluid sorption. Fracture aperture reduction and divergent displacement were not observed in a control experiment with decane. Thus, at low confining pressures, the self-sealing process in clay-rich shales is dominated by swelling, rather than creep, and can occur relatively quickly (< 30 minutes).
AU  - Wenning,QC
AU  - Madonna,C
AU  - Petrini,C
AU  - Giardini,D
AU  - Kurotori,T
AU  - Hwang,J
AU  - Pini,R
AU  - Zappone,A
AU  - Wiemer,S
PY  - 2021///
TI  - X-ray CT imaging of displacement-and swelling-induced fracture aperture changes in clay-rich rock
ER  -

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