Biosketch

Jishan Liu is a Professor at School of Engineering, the University of Western Australia. His main interests are multiphysics modelling of fractured media with applications to unconventional gases extraction, carbon neutrality and coal mine safety. His official profile can be found at:
https://research-repository.uwa.edu.au/en/persons/jishan-liu/

Introduction of the Lecture

Available permeability data sets of low permeable rocks such as coal and shale are apparently disordered and cannot be fully explained by the conventional theory of poroelasticity under common assumptions. This lecture will detail how this inability of poroelasticity is resolved through permeability map. Basic steps include (1) introduction of multi-scale REV (representative elementary volume) concept; (2) removal of thermodynamic equilibrium assumption; (3) introduction of thermodynamic equilibrium index (TEI); (4) development of the TEI-based permeability model; (5) development of the TEI-based experimental approach of permeability evolution; (6) modelling of non-equilibrium multiphysics involved; and (7) construction of a permeability map. Results demonstrate that available permeability data sets seem random but are in fact an integral part of the permeability map and that the TEI-based permeability model is the key cross-coupling relation for non-equilibrium multiphysics of fractured media.