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| Titel |
Effect of permeability heterogeneity on CO2 injectivity and sweep efficiency based on numerical simulations |
| VerfasserIn |
Liang Tian, Zhibing Yang, Fritjof Fagerlund, Auli Niemi |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250112784
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| Publikation (Nr.) |
 EGU/EGU2015-12961.pdf |
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| Zusammenfassung |
| We study effect of geological heterogeneity on the injection of supercritical CO2 into a deep
saline aquifer at the scale of a pilot test site, based on numerical modeling. The effect of
heterogeneity on storage capacity is investigated by assessing the effect on sweep
efficiency and on injectivity. Log-normally distributed random permeability fields
characterized by their standard deviation (Ïă) and correlation length (λ) are generated and
injection simulations conducted for each realization of the permeability fields with
TOUGH2/ECO2N code. A range of injection pressures is tested as well. The results indicate
that injectivity increases with the increased horizontal correlation length given that
the vertical correlation length is fixed and significant inter-realization variation is
seen when changing the standard deviation. Sweep efficiency is favored by smaller
horizontal correlation length. For cases with increased standard deviation, the sweep
efficiency shows significant inter-realization variability. Finally, it can be shown
that both sweep efficiency and injectivity can be expressed as simple functions of
medium heterogeneity characteristics, standard deviation (Ïă) and correlation length
(λ). |
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