 |
| Titel |
Stable isotope reactive transport modeling in water-rock interactions during CO2 injection |
| VerfasserIn |
Juan J. Hidalgo, Vincent Lagneau, Pierre Agrinier |
| Konferenz |
EGU General Assembly 2010
|
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 12 (2010) |
| Datensatznummer |
250041803
|
|
|
|
|
|
| Zusammenfassung |
| Stable isotopes can be of great usefulness in the characterization and monitoring of CO2
sequestration sites. Stable isotopes can be used to track the migration of the CO2 plume and
identify leakage sources. Moreover, they provide unique information about the chemical
reactions that take place on the CO2-water-rock system. However, there is a lack of
appropriate tools that help modelers to incorporate stable isotope information into the flow
and transport models used in CO2 sequestration problems.
In this work, we present a numerical tool for modeling the transport of stable isotopes in
groundwater reactive systems. The code is an extension of the groundwater single-phase flow
and reactive transport code HYTEC [2]. HYTEC’s transport module was modified to include
element isotopes as separate species. This way, it is able to track isotope composition of the
system by computing the mixing between the background water and the injected solution
accounting for the dependency of diffusion on the isotope mass. The chemical module and
database have been expanded to included isotopic exchange with minerals and the
isotope fractionation associated with chemical reactions and mineral dissolution or
precipitation.
The performance of the code is illustrated through a series of column synthetic
models. The code is also used to model the aqueous phase CO2 injection test carried
out at the Lamont-Doherty Earth Observatory site (Palisades, New York, USA)
[1].
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, July 2009.
[2]   Jan van der Lee, Laurent De Windt, Vincent Lagneau, and Patrick Goblet.
Module-oriented modeling of reactive transport with HYTEC. Computers &
Geosciences, 29(3):265–275, April 2003. |
|
|
|
|
|
|