Combining Experiments and Simulations to tackle Hydro-Mechanically Coupled Processes in Natural Fractures

Daniel Vogler1, Florian Amann1, Peter Bayer1, Derek Elsworth2
2 Pennsylvania State University

O 5.4 in Deep geothermal reservoirs - synergies and conflicts

16.04.2016, 10:30-10:45, Audimax B, Geb. 30.95

Enhanced geothermal reservoirs rely on sufficient flow production rates to ensure economic feasability. Deep geothermal reservoir sites, for example in granite, permeability in fractures and fracture networks is orders of magnitude larger than in intact rock. This stresses the importance to study qualitative trends of permeability response to stress changes in reservoirs and attempt to quantify flow magnitudes in natural fractures as well. Our work focusses on experiments and numerical simulations of Hydro-Mechanical processes in heterogeneous fractures. In detail, permeability responses to cyclic confining pressures on natural granite fractures are presented. The results give insight into flow field evolution during changes in normal stress and the relationship of hydraulic and mechanic aperture. Analysis of fracture surfaces and surface damage during testing and gauge material production allow to relate these effects to permeability evolution. Numerical results of Hydro-Mechanical simulations of the tested samples are also presented.



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