Hydrostatic pressure tests for the permeability - formation factor relation on crystalline rocks from the KTB drilling project |
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Authors: | Dieter Freund Georg Nover |
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Institution: | (1) GeoForschungsZentrum Potsdam, Potsdam, Germany;(2) Mineralogisches Institut, Universität Bonn, Bonn, Germany |
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Abstract: | Transport properties (permeability and electrical conductivity) have been measured at different hydrostatic pressure runs on 7 crystalline rocks (gneisses and amphibolites) sampled from the KTB drilling project. The decrease of permeability by pressure are compared with the pressure-dependent data of the electrical conductivity (formation factor) resulting from complex impedance measurements. According to the equivalent-channel model (ECM), there exists a linear relationship between these parameters by representing both properties on logarithmic scales. The results show that it is possible to extrapolate high-pressure permeability from low-pressure (< 60 MPa) permeability data by using the pressure-dependent electrical conductivity (up to 300 MPa). |
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Keywords: | Crystalline rocks equivalent channel model hydrostatic pressure permeability resistivity formation factor |
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