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Monitoring of cap-rock integrity during CCS from field data at the Ketzin pilot site (Germany): Evidence from gas composition and stable carbon isotopes

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Nowak,  Martin
Molecular Biogeochemistry Group, Dr. G. Gleixner, Department Biogeochemical Processes, Prof. S. E. Trumbore, Max Planck Institute for Biogeochemistry, Max Planck Society;

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Citation

Barth, J. A. C., Nowak, M., Zimmer, M., Norden, B., & van Geldern, R. (2015). Monitoring of cap-rock integrity during CCS from field data at the Ketzin pilot site (Germany): Evidence from gas composition and stable carbon isotopes. International Journal of Greenhouse Gas Control, 43, 133-140. doi:10.1016/j.ijggc.2015.10.017.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0029-1E1A-1
Abstract
Cap-rock integrity is a key issue in Carbon Capture and Storage (CCS) technologies. At the Ketzin pilot site, new drill cores of sealing- and reservoir formations were retrieved from a depth range of 620⬜701 m below ground level (b.g.l.). These strata have been exposed to injected CO2 under field conditions for more than four years. Here we present data on cap-rock and reservoir lithologies, CO2 concentrations and their stable carbon isotope ratios (View the MathML sourceδCCO213). CO2 concentrations within the mudstone-dominated cap-rock were <1% (i.e. 10 000 ppmV) with corresponding carbon isotope values between ↙18.6⬰ and ↙29.4⬰. Below the boundary between the cap-rock and the reservoir, CO2 concentrations of more than 90% with mean View the MathML sourceδCCO213 values around ↙36.5⬰ were measured. Below this section, between 648 and 655 m b.g.l., CO2 concentrations decreased again in the clayey and silty lithology of the reservoir to less than 2%, but maintained a depleted View the MathML sourceδCCO213 value of around ↙34.2⬰. At depths below 662 m b.g.l., the CO2 concentrations decreased to values of less than 10 000 ppmV and showed corresponding increases to View the MathML sourceδCCO213 values between ↙15.9⬰ and ↙27.6⬰. Both isotope and CO2 concentration confirm that no CO2 from the reservoir penetrated the cap-rock at the Ketzin pilot site after four years of injection.