Overpressured Marine Sediments. Volume III: Thermal Conductivity, Electrical Resistivity, and Permeability of Saturated Sediment at Various Porosities

摘要

The thermal conductivity of sea water saturated clays, kaolinite, illite and bentonite, and sea water saturated Ottawa sand was determined in both the horizontal and vertical direction after they had been compressed in a consolidometer with vertical pressure as high as 10,000 psi. The vertical thermal conductivity did not seem to be much influenced by the type of clay mineral or the porosity. All clays showed anisotropic thermal conductivity. The horizontal thermal conductivity of illite and bentonite was independent of porosity. The horizontal thermal conductivity of kaolinite increases as porosity decreased. An attempt was mde to determine the vertical and horizontal electrical resistivity as a function of porosity. The results are inconclusive. Using a nonconducting consolidometer it was found that the saturated clay electrical resistivity substantially decreased as either the applied voltage or duration of test increased. The same trend was observed in both the horizontal and vertical direction using either alternating current or direct current.