TRANSIENT SOLUTIONS FOR TEMPERATURE AND PRESSURE WAVES IN FLUID-SATURATED POROUS ROCKS

In this paper, hot-fluid migration dynamics for a fluid-saturated poro us rock is analysed theoretically. We first recall a Bonafede model im plemented with a classical scale analysis; this allows us to discuss a fully non-linear formulation related to transient phenomena, which is solved analytically as a solitary shock wave. The resulting timescale s are particularly small, corresponding to intense short-time geotherm al phenomena. A novel non-linear migration mechanism, related to Darcy convection, is also discussed.