Fracture Mechanisms in Organic-Rich Shales: Role of Kerogen
Author(s)Brochard, Laurent; Hantal, Gyorgy Miklos; Laubie, Hadrien H; Ulm, Franz-Josef; Pellenq, Roland Jm
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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.
DepartmentMassachusetts Institute of Technology. Department of Civil and Environmental Engineering
American Society of Civil Engineers (ASCE)
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.
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