Stoneley waves, radial waves, and method of measuring permeability and electroacoustic constant of saturated porous media

A two-mode method of measuring permeability and electroacoustic constant in the course of borehole logging is considered. The first mode is the Stoneley wave with its electroacoustic ratio; the second mode is the radial wave in the formation around the borehole with the electric field it generates. The radial wave enables one to measure the electroacoustic constant and the Stoneley wave, the electroacoustic ratio, linearly dependent on permeability. Using these measurements jointly enables one to find permeability of the porous medium. All formation evaluation can be reduced to an additional measurement of electric conductivity.