Influence of temperature on the permeability of rocks

Changes in physical properties due to temperature increase have been investigated for three generically different types of rock: marble, sandstone and granite. The Hg-porosity and permeability of the rocks were analysed. The permeability of the specimens was determined during axial loading at a constant triaxial state of stress. Greater permeability changes were registered for rocks with compact structure and low porosity. These types of rock are characterised by line contacts between the grains. They are more sensitive to temperature increase; pores with a radius greater than 500 nm increase due to the temperature influence, with the permeability increasing considerably.