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| Titel |
Comparison between a vertical equilibrium model and a three-dimensional multiphase flow model for CO2 sequestration in geologic formations |
| VerfasserIn |
Byeongju Jung, Liang Tian, Auli Niemi |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250092441
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| Publikation (Nr.) |
 EGU/EGU2014-6789.pdf |
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| Zusammenfassung |
| The vertical equilibrium (VE) approach, assuming pore fluid pressure equilibrium in a
vertical direction, becomes more popular within the CO2 geosequestration research
community due to its computational efficiency compared to three-dimensional multiphase
flow models. However, the accuracy of this simplified pseudo 3-D numerical method has not
fully verified for basin-scale geologic CO2 storage applications. To address this problem, we
have compared CO2 plume migration in a homogeneous aquifer for benchmarking,
calculated by both VE approach and 3-D model implemented by TOUGH2/ECO2N
code. Then further comparison on injected fluid pressure and CO2 transport was
performed using a more complicated numerical grid having a realistic reservoir topology.
Preliminary results show that the VE model is generally in good agreement with
the 3-D model in terms of overpressure ratio, whose values are similar and reach
~60% at the injection well installed in the reservoir with permeability of 4.0 x
10-14m2 and porosity of 15%. The migration distance of CO2 plume estimated by
both models also matched closely, showing ~10 km dispersion along with flow
path after 0.5 MtCO2/year injection for 50 years. The results also suggest that the
VE approach can be an efficient alternative method for CO2 storage modeling,
especially when reservoir formations have relatively small vertical heterogeneity. |
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