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| Titel |
A reactive transport model of CO2 injection in basaltic rocks |
| VerfasserIn |
Juan J. Hidalgo, Caroline de Dieuleveult, Pierre Agrinier, Vincent Lagneau |
| 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 |
250056355
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| Zusammenfassung |
| A CO2 injection was carried out at the Lamont-Doherty Earth Observatory site (Palisades,
New York, USA) to assess the basalt neutralization capacity [1]. The essay consisted of a
single-well push-pull test in which an CO2-rich solution was injected in the aquifer and
pumped after a 24 days incubation period. Chloride was added as a inert tracer and 18O was
measured as a second conservative tracer.
We present a reactive transport model of the push-pull test made with HYTEC
code [2]. Flow and transport parameters were calibrated using data from pumping
and recovery tests and by fitting the chloride breakthrough curve. δ18O was used
to validate the calibrated parameters. The model shows that conservative tracers
arrival is mainly controlled by the product of porosity times longitudinal dispersion.
Chemical processes were identified using the reactive transport model. Results
show that the interaction between CO2 and the basaltic host rock is governed by the
kinetic dissolution of carbonate minerals and plagioclase. An estimation of the
mineral dissolution rates was obtained by fitting the arrival curves of the major
ions.
References
[1]   N. Assayag, J. Matter, M. Ader, D. Goldberg, and P. Agrinier. Water-rock
interactions during a CO2 injection field-test: Implications on host rock dissolution
and alteration effects. Chemical Geology, 265(1-2):227–235, 2009.
[2]   J. van der Lee, L. De Windt, V. Lagneau, and P. Goblet. Module-oriented
modeling of reactive transport with HYTEC. Computers & Geosciences,
29(3):265–275, 2003. |
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