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| Titel |
Modeling of far-field pressure plumes and brine migration for CO2 geological storage |
| VerfasserIn |
Zhibing Yang, Auli Niemi, Liang Tian |
| Konferenz |
EGU General Assembly 2013
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 15 (2013) |
| Datensatznummer |
250081674
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| Zusammenfassung |
| Carbon sequestration in deep saline aquifers involves injection of large volumes of CO2
which causes pressure increase in the reservoir formations. Recent work shows that the region
of pressure increase can reach distances from the injection well that are far beyond the CO2
plume itself. The adverse far-field impacts (e.g., for near-surface fresh-water aquifers) of the
pressure build-up and brine migration can become a limiting factor for CO2 storage
capacity. It is therefore needed to carefully examine the evolution and impact of
the pressure plume and far-field brine migration caused by commercial scale CO2
injection under different conditions. Given the large size of the domains of interest,
this poses a challenging modeling and parameter estimation problem, including
issues of parameter upscaling. This study investigates the effect of several factors
on the size of the propagating pressure plume and the magnitude of the pressure
build-up. These factors include: (i) formation geometry and boundary conditions;
(ii) depth-dependent formation material properties; and (iii) brine leakage through
fractures zones and/or faults in the overlying units. For the reservoir formation
we consider both generic and site-specific large-scale models, the latter based on
data from formations in the Baltic Sea region. Numerical simulations for these
large-scale models are conducted using both the full multiphase flow modeling
approach and more simplified single-phase approaches. The simulation results are also
discussed in terms of comparison to simple analytical and semi-analytical solutions. |
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