Scaling of Transport Coefficients of Porous Media under Compaction

Details Scaling of Transport Coefficients of Porous Media under Compaction Scaling of Transport Coefficients of Porous Media under Compaction

2011-01-12

arxiv.org/abs/1101.2387v5

Europhysics Letters, Vol. 95(6), 64004 (2011)

Physics

Fluid Dynamics

6 pages, 2 figures

Scientific paper

10.1209/0295-5075/95/64004

Porous sediments in geological systems are exposed to stress by the above-laying mass and consequent compaction, which may be significantly nonuniform across the massif. We derive scaling laws for the compaction of sediments of similar geological origin. With these laws, we evaluate the dependence of the transport properties of a fluid-saturated porous medium (permeability, effective molecular diffusivity, hydrodynamic dispersion, electrical and thermal conductivities) on its porosity. In particular, we demonstrate that the assumption of a uniform geothermal gradient is not adequate for systems with nonuniform compaction and show the importance of the derived scaling laws for mathematical modelling of methane hydrate deposits; these deposits are believed to have potential for impact on global climate change and Glacial-Interglacial cycles.

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