Modelling and parameterisation of CO2 storage in deep saliniferous formations for dimension and risk analyses
For the acceptance of new technologies, such as the storage of CO2 in deep geological formations (CCS), a well-founded risk assessment and risk analysis is essential. Required are therefore monitoring strategies and policies during and after an injection for both regular operation as well as the detection of a possible leakage. Testing and evaluating these strategies is difficult at existing sites, due to a lack of understanding of the system parameters, especially the spatially distributed geologic parameters, and the actual processes taking place. Testing of the required methods however can be carried out using synthetic numerical modeling studies, as in these cases the parameters and the processes involved are known exactly.
The modeling and numerical simulation of injection and propagation of CO2 in geological formations will play a crucial role for the understanding of the physico-chemical processes acting on different time and length scales as well as for the evaluation of efficiency and safety of the site considered. To perform these simulations, both the appropriate simulation programs as well as the appropriate parameters are necessary. Within the project, therefore the parameters and numerical simulation of the coupled thermo-hydro-mechanical-chemical processes in the reservoir has been considered. The spatial parameterization of geological structures was investigated exemplarily for Schleswig-Holstein. For parameterization, comprehensive data and literature evaluations were performed for all the necessary parameters, particularly examining conditions for consistent geochemical parameterizations. Based on experiments carried out in the project, geomechanical processes and kinetic mineral dissolution were quantified experimentally. For the numerical simulation of CO2 storage, a numerical modeling system was developed that represents the governing processes involved. The respective process couplings were implemented and their impact quantified. The effects of a CO2 storage operation were evaluated both by hydraulic monitoring methods as well as a geophysical monitoring using synthetic seismic, geoelectric and gravity measurements. Using a virtual site scenario, the entire work flow of geological and geometrical parameterization, process parameterization and numerical process simulations with subsequent evaluation of the effects induced as well as of strategies for their monitoring was performed and its applicability demonstrated.
- Institute for Geosciences, Kiel University
- Helmholtz Centre for Environmental Research GmbH – UFZ
- Institute for Modelling Hydraulic and Environmental Systems, University of Stuttgart
- Geological Survey Schleswig-Holstein, State Agency for Agriculture, Environment and Rural Areas
April 2008 - March 2011
This study was funded by the German Federal Ministry of Education and Research (BMBF), EnBW Energie Baden-Württemberg AG, E.ON Energie AG, E.ON Gas Storage AG, RWE Dea AG, Vattenfall Europe Technology Research GmbH, Wintershall Holding AG and Stadtwerke Kiel AG as part of the CO2-MoPa joint project in the framework of the Special Program GEOTECHNOLOGIEN.