The aim of the integrated Geo-Dat project is to set up a thermodynamic database for the modelling of complex geochemical processes in deep geothermal layers of the North German Basin. Results from the integrated project will later be incorporated into the thermodynamic reference database THEREDA.
The project is implemented in several steps. To begin with, the data already existing in THEREDA are supplemented through database-driven research and own laboratory tests. Based on the extended data set, parameter files will then be generated specifically for geothermal considerations. Once the data set is complete, a reservoir model is developed with the objective to represent the conditions in a geothermal reservoir as realistic as possible.
Regarding its physical and geochemical boundary conditions, the structure of the model will be oriented towards sites known in the North German Basin. It is intended to use the model for further testing of the data base and investigations on the impacts of different influencing factors.
Validation with data from the practice
At the geothermal site Groß Schönebeck, extensive fluid monitoring takes place in parallel. All relevant chemical parameters are measured upstream and downstream of a heat exchanger in liquid and solid phase (mineral precipitates). The large dataset obtained this way allows the review (validation) of the model calculations performed with the new database.
Task of GRS
GRS co-ordinates all activities within the project related to the development of the thermodynamic database. GRS has expertise in the determination of data and parameters for thermodynamic modelling. For this purpose, the Geoscientific Laboratory is also available, which is equipped to meet the special experimental requirements with regard to highly saline solutions.
Co-operation partners of GRS in this integrated project are the Helmholtz Centre Potsdam ‒ GFZ German Research Centre for Geosciences and the Institute of Inorganic Chemistry of the TU Bergakademie Freiberg.