CO2RINA: Methoden zur Durchführung von Risikoanalysen für die Speicherung von CO2 im tiefen geologischen Untergrund

Within the scope of the research project CO2RINA, a uniform and at the same time transparent methodology for risk analyses for the storage of CO2 in the deep geological underground was developed and tested. The following risks considered were:

• carbon migration across fault zones to higher reservoir levels
• chemical interaction of CO2 with the reservoir host rock and mobilisation of groundwater-polluting substances
• Damage to the borehole cementation by CO2
• Damage of barriers
• Induced seismicity
• Displacement of reservoir fluids and possible upwelling into groundwater levels

The methodology developed is site-independent. While probabilistic risk analyses are usually based on simplifications, the methodology developed in CO2RINA accurately models complex coupled THMC processes in the geological system including all interactions. The results of these models are transferred via specially developed interfaces to the central system simulation tool based on GoldSim, which later performs Monte Carlo simulations.

G.E.O.S. acted as project coordinator in the following areas:

• Project coordination with the project partners Geo Research Centre Potsdam (GFZ), RWTH Aachen and DMT Engineering Surveying.
• Development of the methodological basics and the conceptual models as a basis for the reservoir simulations
• Probabilistic system simulation model with especially developed interfaces to the detailed models
• Integration of more detailed models including the reservoir model for the deposit
• Coupled model for the description of damage to the cementing of the boreholes
• Verification of the concept using data gathered in Ketzin (Germany)