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4.3 Phase Permeabilities of a Medium with Mixed Wettability . . . . . 69
4.4 Three-Phase Steady State Flow of Immiscible Newtonian Fluids . 79
4.5 Stability of Percolation Methods for Calculation of Phase Perme-
abilities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
5 Percolation Model of Non-Steady State Two-Phase Flow in Porous
Media 89
5.1 Immiscible Displacement of a Viscous Fluid by a Non-Viscous One 89
5.2 Effects of Viscosities and Interfacial Tension . . . . . . . . . . . 98
6 Determination of Pore Size Distribution in Grained and
Cavernous Rocks 105
6.1 Percolation Model for the Mercury Injection Test . . . . . . . . 106
6.2 Percolation Model for the Electric Porometry Method . . . . . 112
6.3 Percolation Model for the Combined Mercury and Electric Poro-
metry Method . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119
6.4 Numerical Calculations and Core Data Processing with the Electric
Porometry Method . . . . . . . . . . . . . . . . . . . . . . . . 122

7 Methods for Determining Parameters of Fractured Rocks 129
7.1 Concentration and Average Length of Fractures Determined from
the Core . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130
7.2 Determination of Fracture Length Distribution from Fracture Traces
on the Core . . . . . . . . . . . . . . . . . . . . . . . . 132
7.3 Determination of Fracture Parameters from the Core . . . . . . . . 136

II Effects of Physical Fields on Recovery of Mineral
Resources 139

8 Conductivity of a Heterogeneous Medium under Impulse and
Alternating Current 143
8.1 Threshold Values for Electric Treatment with Impulse Current 143
8.2 Permeability and Electric Conductivity under Impulse Current 147
8.3 Determination of Threshold Values for Electric Treatment . . . 151
8.4 Permeability and Electric Conductivity after Electric Treatment 152
9 Changing Conductivity and Pore Space Structure with Electric
Current. Experiments 157
9.1 Conductivity of Sandy-Argillaceous Medium . . . . . . . . . . . . . 157
9.2 Pore Space Structure of a Sandy-Argillaceous Medium after Electric
Treatment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 160