Tel.: +49 341 235 1360
Fax: +49 341 235 1443
Helmholtz-Zentrum für Umweltforschung - UFZ
|since 09/2009||PhD student at the Department of Isotope Biogeochemistry|
|08/2009||Diploma in Geology, Department of Geosciences, Martin-Luther University, Halle-Wittenberg|
Simulation of a carbon dioxide leakage into a near-surface aquifer
Carbon capture and storage (CCS) is seen as one option in the future to reduce the amount of CO2 in the atmosphere. Due to numerous studies on the sequestration of carbon dioxide in deep geological formations, like deep saline aquifers (> 800m) or deep not mineable coal seams (> 1500m) a leakage scenario has to be considered. The isotopic signature of the organic carbon of fossil fuels is in contrast to the CO2 of the atmosphere depleted of 13C by about 20 to 30‰ (PDB). A monitoring system for a leakage of carbon dioxide into a near-surface aquifer by using the different isotopic ratios of the atmospheric CO2 and the CO2 of fossil fuels should be developed.
Different batch experiments with aquifer-characteristic microorganisms under increasing CO2 stress, using supercritical and gaseous CO2, should be performed to investigate survival rates. Furthermore batch experiments (temperatures between 25 and 100°C and pressures between 1 and 150 bar) on single mineral phases (kalifeldspar, forsterite, galenite) and drilling cores (Rotliegend sandstones, basalts, coal) that are common for sequestration sites will be done, to examine the isotopic ratios before and after the injection of CO2.