Abstract
Although the measurement of thermal rock properties is tedious and time consuming, they can provide valuable information on lithology, structure and fluids of porous rocks. Presented here are the results of an experimental and theoretical investigation on the total heat conductivity, thermal diffusivity and specific heat capacity of porous rocks in their relation to the respective properties of framework and various fluids: Wiener's mixing rule provides much better fit to the laboratory data than the often applied geometric mean. Also, a better understanding of the temperature dependency of those thermal rock properties was an objective of this investigation: Inhomogeniuos-linear relations to absolute temperature were found for the inverse heat conductivity and the inverse temperature diffusivity, while for either of these quantities the respective proportionality factors and the absolute constants vary in opposite direction, among rocks. Furthermore a strange fact is reported requiring the assumption of a chemico-physical interaction between solid rock framework and pore fluid, to comply with experimental findings: The heat capacity of wetting-liquid filled porous rocks has been observed considerably larger than the sum of the heat capacities of liquid and rock framework alone.
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