Enhanced Geothermal Reservoir Characterization Using Wireline Distributed Acoustic Sensing
E.M. Martuganova (TU Delft - Applied Geophysics and Petrophysics, GFZ Helmholtz-Zentrum für Geoforschung)
Ben Norden (GFZ Helmholtz-Zentrum für Geoforschung)
Guido Blöcher (GFZ Helmholtz-Zentrum für Geoforschung)
C. M. Krawczyk (GFZ Helmholtz-Zentrum für Geoforschung, Technical University of Berlin)
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Abstract
Successful across-scale reservoir characterization is a prerequisite for sustainable utilization of the subsurface. Here, we discuss aspects of distributed acoustic sensing (DAS) vertical seismic profiling (VSP) acquisition in Germany and provide an example of data integration for reservoir characterization at the geothermal research platform Groß Schönebeck, aiming to utilize Permian and Permo-Carboniferous reservoir sections at depths below 4 km. At this site, DAS VSP wireline data obtained in two boreholes were processed successfully for 3D interpretation. The data and their interpretation serve as input for a fundamental update of the structural and property characterization of the reservoir zones, relying on the integration of conventional surface 3D seismics and joint core-log analysis. The new model provides a much more detailed characterization of the target reservoirs, allowing for the first time a geological-based (facies-driven) parameterization of the subsurface, considering hydraulic and thermal properties of the reservoir-forming rocks.