| Time: |
November 19, 2013 |
| Lecturer: |
Alexandros Tasianas
Department of Geology, University of Tromsø, Norway |
| Venue: |
Pfaffenwaldring 61, Raum U1.003 (MML), Universität Stuttgart
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| Download as iCal: |
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The Snøhvit reservoir and overburden have been an important location for testing CCS techniques. CO2 injection into the Tubåen and lower parts of the Stø formations has taken place since 2008. Geological modeling, undertaken as part of the ECO2 project activities has allowed to model the local stratigraphy and any potential fluid flow pathways. Identification of potential leakage pathways, such as gas chimneys and faults, and their incorporation into these models and simulations will provide a realistic insight into the likelihood of leakage and the extent and pathways involved. We thus aim at assessing the potential for CO2 leakage with a focus on leakage along faults and gas chimneys.Depending on the leakage mode, different types of domain sizes and grid resolutions (50m by 50m or 100m by 100m) were used and populated with properties such as porosity (Phi), permeability (K), Total Oganic Carbon, [Cl],[CaCO3], [CH4] and various alkalinities. The sensitivity analysis applied to these models will allow us to obtain a large statistical dataset by varying different parameters such as background K, fault K and fault thickness for the fault scenarios and background K, K of zone 9 and K chimney for the gas chimney scenarios. This sensitivity analysis will further allow us to understand which parameters are more sensitive for the leakage scenario. By providing valuable information for future research it will show what parameters are important for the leakage assessment.
