Abstract

The study is aimed at changes in the permeability of rocks, partially sealed by mineral filling, under the effect of brine, which infiltrates from a salt dumb and is diluted by groundwater. Changes in the ionic strength of solution determine saturation deficiency with respect to minerals, resulting in the dissolution of the filling and changes in the permeability of fractures. Flow in porous medium, mass transport, and thermodynamic equilibria where jointly simulated using PHT3D program with additional revaluation of hydraulic characteristics. A narrow domain with higher permeability, which was found to form at the upper boundary of the gypsified zone, has almost no effect on the waterproof properties of the above-salt stratum in a potassium salt deposit during the operation of a salt dumb.

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