NDLI: Reactivity of sandstone and siltstone samples from the Ketzin pilot CO$_{2}$ storage site-Laboratory experiments and reactive geochemical modeling

Content Provider	Springer Nature Link
Author	Fischer, Sebastian Liebscher, Axel Lucia, Marco Hecht, Lutz
Copyright Year	2013
Abstract	To evaluate mineralogical-geochemical changes within the reservoir of the Ketzin pilot CO$_{2}$ storage site in Brandenburg, Germany, two sets of laboratory experiments on sandstone and siltstone samples from the Stuttgart Formation have been performed. Samples were exposed to synthetic brine and pure CO$_{2}$ at experimental conditions and run durations of 5.5 MPa/40 °C/40 months for sandstone and 7.5 MPa/40 °C/6 months for siltstone samples, respectively. Mineralogical changes in both sets of experiments are generally minor making it difficult to differentiate natural variability of the whole rock samples from CO$_{2}$-induced alterations. Results of sandstone experiments suggest dissolution of the anorthite component of plagioclase, anhydrite, K-feldspar, analcime, hematite and chlorite + biotite. Dissolution of the anorthite component of plagioclase, anhydrite and K-feldspars is also observed in siltstone experiments. In an inverse modeling approach, an extensive set of equilibrium simulations was set up in order to reproduce the experimental observations of the sandstone experiments. Simulations generally show fairly good matches with the experimental observations. Best matches with measured brine data are obtained from mineral combinations of albite, analcime, anhydrite, dolomite, hematite, illite, and kaolinite. The major discrepancies during equilibrium modeling, however, are reactions involving Fe$^{2+}$ and Al$^{3+}$. The best matching subsets of the equilibrium models were finally run including kinetic rate laws. These simulations reveal that experimentally determined brine data was well matched, but reactions involving K$^{+}$ and Fe$^{2+}$ are not fully covered. The modeling results identified key primary minerals as well as key chemical processes, but also showed that the models are not capable of covering all possible contingencies.
Starting Page	3687
Ending Page	3708
Page Count	22
File Format	PDF
ISSN	18666280
Journal	Environmental Earth Sciences
Volume Number	70
Issue Number	8
e-ISSN	18666299
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2013-08-11
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Laboratory experiments Sandstone and siltstone reactivity Geochemical modeling CO$_{2}$ storage Ketzin pilot site Geology Hydrology/Water Resources Geochemistry Environmental Science and Engineering Terrestrial Pollution Biogeosciences
Content Type	Text
Resource Type	Article
Subject	Global and Planetary Change Earth-Surface Processes Soil Science Environmental Chemistry Pollution Geology Water Science and Technology

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