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| Titel |
Active microbial community in gas reservoirs in the North German Plain and the effects of high CO2 concentrations |
| VerfasserIn |
Janin Frerichs, Claudia Gniese, Martin Mühling, Martin Krüger |
| Konferenz |
EGU General Assembly 2010
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 12 (2010) |
| Datensatznummer |
250031974
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| Zusammenfassung |
| From the IPCC report on global warming, it is clear that large-scale solutions are needed
immediately to reduce emissions of greenhouse gases. The CO2 capture and storage offers
one option for reducing the greenhouse gas emissions. Favourable CO2 storage sites are
depleted gas and oil fields and thus, are currently investigated by the BMBF-Geotechnologien
RECOBIO-2 project. Our study is focussing on the direct influence of high CO2
concentrations on the autochthonous microbial population and environmental parameters
(e.g. availability of nutrients).
The gas fields Schneeren in the “North German Plain” is operated by Gaz de France
SUEZ E&V Deutschland GmbH. The conditions in the reservoir formation waters of two
bore wells differ in various geochemical parameters (pH, salinity and temperature). In
previous studies the community of this gas field was described by Ehinger et al. 2009. Based
on these results our study included cultivation and molecular biological approaches. Our
results showed significant differences of the community structure in regional distinctions of
the gas reservoir.
The activity profiles of two wells differed clearly in the inducible activity after substrate
addition. The fluids of well A showed a high methane production rate after the
addition of methanol or acetate. Well B showed a high sulphide production after
the addition of sulphate and hydrogen. The molecular biological analysis of the
original fluids supports the activity profile for both sites. The community analysis
via real-time PCR showed for the production well head A a higher abundances
for Archaea than for B. The community at site B in contrast was dominated by
Bacteria.
Fluids of both wells were also incubated with high CO2 concentrations in the headspace.
These enrichments showed a significant decrease of methane and sulphide production with
increasing CO2 levels. Currently, the community composition is analysed to identify changes
connected to increased CO2 concentrations. This will provide information about
possible biogeochemical and microbiological changes during and after the storage of
CO2, and effects on the storage capacity and injectivity of the reservoir formation. |
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