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| Titel |
Systematic evaluation of experimental parameters and identification of data gaps for geochemical modeling in the context of geological CO2 storage |
| VerfasserIn |
Susanne Stadler, Andreas Riße, Katja Heeschen, Heike Rütters, Christian Ostertag-Henning |
| Konferenz |
EGU General Assembly 2011
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250056540
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| Zusammenfassung |
| Geochemical modeling is an important tool for understanding the interaction of CO2 with
formation fluids and rocks in the context of Carbon Dioxide Capture and Storage (CCS).
Plenty of geochemical data exist in the literature, though those are often patchy due to the
involved number of components, the broad range of pressure and temperature conditions
relevant for geological CO2 storage and the high salinity of the involved brines. In addition,
some parameters have a non-linear dependency, the effects of which have to be
considered if extrapolation is attempted to fill gaps not covered by experimental data. We
present a compilation of literature data on the experimental solubility of CO2- H2O
and several mineral-H2O-CO2-electrolyte systems within the pT-field of typical
potential formation conditions as found in the Northern German Basin. These data
will later be used for a simulation of more complex fluid-fluid-mineral interactions
that will be conducted within the project COORAL (=CO2 Purity for Capture and
Storage). In our contribution we show a systematic parameter evaluation for data of
monomineral interaction with CO2 in the presence of defined electrolyte solutions. We
show results of a set of experiments of up to 768 h duration at 200 bar and 120°C
(with 150 g/L NaCl) where we added and/or varied specific controlling factors. The
experimental data are compared with modeling results applying the geochemical
simulator PHREEQC. In addition to thermodynamic calculations, we test variations in
experimentally derived rate parameters for their sensitivity in kinetic calculations. |
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