4D coupled hydromechanics of porous rocks
Heterogeneity due to localised deformation has significant effects on rock permeability, giving rise to anisotropic flow and producing barriers or conduits. Understanding these effect is key to optimising processes involving extraction or injection of fluids in geologic reservoirs, e.g., hydrocarbon and water production or CO2 sequestration, and understanding natural processes, e.g., earthquake mechanisms. We will perform coupled hydro-mechanical in-situ experiments with 3D imaging of both the evolution of sample structure and of the pressure-driven flow of H2O into D2O saturated samples. The resultant image data will be high-resolution tomographies recording structural evolution, which will be analysed by DVC to quantify the strain field evolution, plus 4D images tracking the fluid flow field at each deformation state. The latter will be analysed to determine the flow velocity field and compared with the strain field evolution to provide the first such data on the coupling of deformation and changes in fluid flow. Different deformation mechanisms will be explored by testing at different confining pressure, from dilatant shear failure to compaction bands.
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Stephen A. Hall; ENGQVIST Jonas; TENGATTINI Alessandro; TUDISCO Erika; Fernando Vieira Lima and WORACEK Robin. (2021). 4D coupled hydromechanics of porous rocks. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.1-05-18
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