Abstract
The 4500m deep research borehole at Urach (South Germany) has been extensively used for hydraulic testing of the crystalline basement. The data permit a general interpretation of the hydraulic properties of crystalline continental upper crust. The typical granitic and gneissic basement contains an interconnected fluid-filled fracture system and behaves hydraulically like a confined fractured aquifer. Thus standard hydraulic well-tests can be used in the basement. The conclusions are based on data from the central part of the upper crust and are, therefore, believed to be characteristic and significant for the brittle upper continental crust in general.
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