Rosenbrand, Esther1; Haugwitz, Christian4; Jacobsen, Peter Sally Munch5; Kjøller, Claus7; Fabricius, Ida Lykke1
1 Department of Civil Engineering, Technical University of Denmark2 Section for Geotechnics and Geology, Department of Civil Engineering, Technical University of Denmark3 Center for Energy Resources Engineering, Center, Technical University of Denmark4 Technical University of Denmark5 Department of Environmental Science and Engineering, Technical University of Denmark6 Geological Survey of Denmark and Greenland7 Geological Survey of Denmark and Greenland
Seasonal energy storage can be achieved by hot water injection in geothermal sandstone aquifers. We present an analysis of literature data in combination with new short-term flow through permeability experiments in order to address physical and physico-chemical mechanisms that can alter permeability when sandstones are heated from 20°C to 70–200°C. The pore surface area per unit pore volume was used to normalise permeability data, so that the temperature effect on samples with different pore size could be compared. In sandstones containing the clay mineral kaolinite, heating reduced permeability, suggesting that the observed permeability reduction was due to kaolinite mobilisation. The effect was partly reversible.
Geothermics, 2014, Vol 50, p. 155-166
Sandstone; Permeability; Temperature dependency; Kaolinite mobilisation