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| Titel |
Distribution and activities of microorganisms in the reservoir and around gas wells in a long-term used gas field in the Altmark, Germany |
| VerfasserIn |
Dagmar Kock, Daria Morozova, Janin Frerichs, Hilke Würdemann, Martin Krüger |
| Konferenz |
EGU General Assembly 2011
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250058048
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| Zusammenfassung |
| As part of a joint research project, microbial communities in the area of the second largest
natural gas field in Europe in the Altmark, Germany are analyzed. The Altmark
gas field operated by GDF SUEZ E&P Germany GmbH is located at the southern
edge of the Northeast German Basin. The reservoir horizons belong to the Permian
Rotliegend formation (Saxon) and have an average depth of about 3500 m. CO2
injection is planned to enhance the recovery of gas in this with conventional extraction
methods nearly depleted gas field (Enhanced Gas Recovery – EGR, BMBF project
CLEAN).
For baseline-monitoring of the deep reservoir microbiological, molecularbiological and
isotopic analyses are used to investigate the microbial community. The δ13C of CO2 and CH4
collected in situ in production waters indicate a thermogenic origin. The reservoir fluids
represent a hypersaline (up to 420g/L) and hot (120-130Ë C) environment. Results of
microbial activities, cell numbers and the identifiation of microorganisms in these reservoir
fluids will be presented.
Microbiological analyses are used to supplement a continuous gas monitoring program at
the soil surface above the EGR-site. Microbial production and consumption of CH4 and CO2
are determined together with the carbon isotopic compositions to separate these indigenous
biological activities from possibly upward migrating reservoir gases including CO2. The
δ13C of CO2 collected in situ was similar to those in incubations, confirming a biological
origin. Archaeal cell numbers were approximately one magnitude lower than bacterial cell
numbers. In all samples the total number of detectable microorganisms was high in
contrast to a generally low activity for CO2 and CH4 production and oxidation. |
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