Abstract
A multidisciplinary approach to make generation of geothermal electricity possible in the NE German basin (NEGB) wasinitiated in 2000. To attain this goal, formation fluids from the 4-km-deep Rotliegend rocks (a known gas reservoir) of the NEGB need to be extracted and their geochemistry determined. An in situ laboratory was established by opening and deepening the former gas well GrSbk 3/90. Hydraulic tests and stimulation experiments focussed on the aeolian sandstones. In situ samples of the 150 °C deep fluids contain high amounts of dissolved solids (salinity: 265 g/l). The most important inflows of geothermal water were detected in the Permo-Carboniferous volcanic rocks and not, as anticipated, from overlying sandstones. Furthermore, the geochemical investigations of the fluid samples indicate that they originated in the andesitic volcanic rocks.
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