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Fracture Mechanisms in Organic-Rich Shales: Role of Kerogen
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.
Fracture Mechanisms in Organic-Rich Shales: Role of Kerogen
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.
Fracture Mechanisms in Organic-Rich Shales: Role of Kerogen
Brochard, Laurent (author) / Hantal, Gyorgy (author) / Laubie, Hadrien (author) / Ulm, Franz J. (author) / Pellenq, Roland J. -M. (author)
Fifth Biot Conference on Poromechanics ; 2013 ; Vienna, Austria
Poromechanics V ; 2471-2480
2013-06-18
Conference paper
Electronic Resource
English
Wave propagation , Shale , Poroelasticity , Mechanics , Cracking , Simulation , Porous media , Porosity
Rate-independent fracture toughness of gray and black kerogen-rich shales
| Online Contents | 2017
Rate-independent fracture toughness of gray and black kerogen-rich shales
| Springer Verlag | 2017
| British Library Online Contents | 2016