3D Seismic Survey for a Petrothermal (EGS) Research Project in Crystalline Rocks of Saxony, Germany

Authors: Ewald LUESCHEN, Hartwig VON HARTMANN, Ruediger THOMAS, Ruediger SCHULZ
Keywords: 3D seismic, exploration, EGS, petrothermal reservoir, crystalline rocks, Erzgebirge
Conference: World Geothermal Congress Session: Exploration
Year: 2015 Language: English
Abstract: 3D seismic measurements have been performed in 2012 to explore a petrothermal reservoir in a granitic environment within the Erzgebirge (Ore Mountains) in Saxony. The intention and challenge is to image and characterize potentially permeable fracture zones at target depths of 5-6 km and temperatures well above 150 °C. This is considered as an EGS (Enhanced Geothermal System) project, if stimulation turns out to be necessary. New innovative and unconventional methods have been applied in field acquisition as well as in data processing and interpretation. The Vibroseis technique was used in the core experiment, accompanied by a special explosive seismic experiment. The 3D seismic reflection technique has been proven as an indispensable tool for geothermal exploration even in a crystalline environment. A rich repertoire of structures within a late-Variscan granite pluton has been imaged. Steeply dipping fault zones and conjugate faults within the granite pluton are imaged. Further analyses for interpretation of the reflective structures will help to define an optimum drill path for a research well which is considered as the next stage for a possible geothermal plant.
File Size: 1689 KB