caa a22 4500 44581490X CHVBK 20180317145223.0 cr unu---uuuuu 170323e20110501xx s 000 0 eng 10.1007/s10040-011-0704-7 doi (NATIONALLICENCE)springer-10.1007/s10040-011-0704-7 Stober Ingrid Department of Environment, Schwendistr. 12, 79102, Freiburg, Germany aut Depth- and pressure-dependent permeability in the upper continental crust: data from the Urach 3 geothermal borehole, southwest Germany [Elektronische Daten] [Ingrid Stober] Perméabilité dépendante de la profondeur et de la pression dans la croûte continentale supérieure: données du forage géothermal Urach 3, Allemagne du Sud-Ouest Durchlässigkeit in der oberen kontinentalen Erdkruste in Abhängigkeit von Tiefe und Druck: Daten aus der Geothermiebohrung Urach 3, Südwest-Deutschland Permeabilidad dependiente de la profundidad y la presión en la corteza continental superior: datos provenientes de la perforación geotermal Urach 3, sudoeste de Alemania 大陆地壳上部渗透率随深度和压力的变化特征----来自于德国西南部Urach 3 地热孔的数据 Permeabilidade dependente da profundidade e da pressão na crosta continental superior: dados da sondagem geotermal Urach-3, no sudoeste da Alemanha Permeability is a critical geologic parameter because migrating fluids play a fundamental role in heat and mass transfer. Because of their assumed low hydraulic conductivities, crystalline basement rocks are being considered for nuclear waste repositories. A compilation of existing data and a description and interpretation of new hydraulic test data in the crystalline basement of the 4.5-km-deep Urach 3 borehole (southwest Germany) are presented, together with an interpretation of all test campaigns for Urach 3. The tests showed that within the crystalline basement, permeability is decreasing with depth. In the Urach borehole many high-pressure tests with well-head pressures of more than 600bar were carried out. During hydraulic tests with well-head pressures above 176bar, permeability of the crystalline basement increased dramatically, showing the elastic reaction of the rock as a result of pressure; during tests with well-head pressures below 176bar, there was no significant elastic reaction of the rock. The pressure-dependent change of transmissivity was described in terms of a set of power laws relating injection rate to transmissivity and fracture width. Probably due to the lack of shear stress, no significant increase in permeability remained after any high-pressure tests. Springer-Verlag, 2011 Germany nationallicence Hydraulic properties nationallicence Crystalline rocks nationallicence Geothermal energy nationallicence Hot dry rock technology nationallicence Hydrogeology Journal Springer-Verlag 19/3(2011-05-01), 685-699 1431-2174 19:3<685 2011 19 10040 https://doi.org/10.1007/s10040-011-0704-7 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10040-011-0704-7 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Stober Ingrid Department of Environment, Schwendistr. 12, 79102, Freiburg, Germany aut NATIONALLICENCE 773 0- Hydrogeology Journal Springer-Verlag 19/3(2011-05-01), 685-699 1431-2174 19:3<685 2011 19 10040 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer