Fracture Mechanisms in Organic-Rich Shales: Role of Kerogen
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13_BIOT_Fracture Mechanisms in Organic-Rich Shales Role of Kerogen.pdf
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Author(s)
Brochard, Laurent
Hantal, Gyorgy Miklos
Laubie, Hadrien H
Ulm, Franz-Josef
Pellenq, Roland Jm
Date Issued
June 2013
Journal
Poromechanics V
Publisher
American Society of Civil Engineers (ASCE)
Citation
Brochard, Laurent et al. “Fracture Mechanisms in Organic-Rich Shales: Role of Kerogen.” Poromechanics V (June 2013): 2471-2480 © 2013 American Society of Civil Engineers.
Version
Author's final manuscript
Abstract
In this work we study role of kerogen in the fracture properties of organic-rich shales and, in particular, in the ductility of shales. The presence of kerogen and clays in shale is known to increase the ductility. We propose here a multiscale approach to develop a fine understanding of shale ductility from the molecular scale. We develop and validate a methodology at the molecular scale that can capture the toughness and ductility of a material. We apply this methodology successfully to a silica polymorph and to a kerogen analog, and we confirm the significant ductility of kerogen. Interestingly the silica-kerogen interface exhibits a similar ductility, which is central for the properties of the heterogeneous shale. Finally, we consider a tentative upscaling considering the pull out phenomenon as a likely mechanism of fracture of the shale.
MIT Department
Massachusetts Institute of Technology. Department of Civil and Environmental Engineering
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DOI of Published Version
https://doi.org/10.1061/9780784412992.288
