The method for correlation of poroperm properties and effective stresses in weakly coherent rocks has been developed and tested on a lab scale. An appropriate lab testing installation is designed and manufactured; it includes a hydraulic press, a system of force plungers, a polyurethane measurement cell to be filled with sized sand, a compressor and a high-precision autonomous measurement system for fluid flow rate and pressure. The method consists in sequential steady-state and unsteady-state flow tests of a granular geomaterial sample placed in the measurement cell where nonuniform stress state generated by application of the external load to the cell. In the unsteady-state flow tests, the change in pressure was measured during gas release from the cell. In the steady-state flow tests, the flow rates were measured at the varied input pressure. The measured flow rates and pressures were used as the given data in the inverse coefficient problems on determinations of the empirical parameters in the exponential dependence of porosity, permeability on effective stress. Resolvability of the formulated inverse problems within the nonlinear models of mass transfer in a granular media is demonstrated.
