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4D Seismic Monitoring of CO2 Storage During Injection and Post-closure at the Ketzin Pilot Site
GFZ German Research Centre for Geosciences, Potsdam, Germany.
GFZ GermanResearch Centre for Geosciences, Potsdam, Germany.
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Geophysics.ORCID iD: 0000-0002-9755-3941
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Geophysics.
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2017 (English)In: Energy Procedia, ISSN 1876-6102, E-ISSN 1876-6102, Vol. 114, p. 5761-5767Article in journal (Refereed) Published
Abstract [en]

At the Ketzin pilot site for geological CO2 storage, about 67,000 tons of CO2 were injected during the period June 2008 – August 2013. Since August 2013, the site is in its post-closure phase. Before and during the injection phase, a comprehensive monitoring programme was established. In the early post-injection phase, a majority of the monitoring activities have continued. The stepwise abandonment of the pilot site, which is planned to be accomplished in 2018, marks also the termination of most monitoring activities. Four 3D seismic surveys were acquired between 2005 and 2015 for characterizing the reservoir structure and its overburden and for monitoring the propagation of the injected CO2 in the storage formation. The first and second repeat surveys revealed the lateral extension of the CO2 plume after injecting 22 and 61 ktons, respectively. In autumn 2015, the third 3D repeat seismic survey, serving as the first post-injection survey, was acquired. The survey was acquired using the same acquisition geometry as for previous surveys, consisting of 33 templates with five receiver lines and twelve source profiles perpendicular to the receiver lines. Seismic processing of the recently acquired data has resulted in preliminary observations which can be summarized as follows: As in previous seismic repeat surveys, a clear CO2 signature is observed at the top of the storage formation. No systematic amplitude changes are observed above the reservoir which might indicate leakage. Compared to the second repeat survey acquired in 2012, the lateral extent of the CO2 plume seems to have been reduced, which may be an indication for ongoing (and relatively fast) dissolution of the CO2 in the formation brine and diffusion into very thin layers indicating pressure release.

Place, publisher, year, edition, pages
Elsevier, 2017. Vol. 114, p. 5761-5767
National Category
Geophysics
Identifiers
URN: urn:nbn:se:uu:diva-328323DOI: 10.1016/j.egypro.2017.03.1714ISI: 000419147306002OAI: oai:DiVA.org:uu-328323DiVA, id: diva2:1134898
Conference
13th International Conference on Greenhouse Gas Control Technologies, GHGT-13, Lausanne, Switzerland, 14-18 November 2016.
Available from: 2017-08-21 Created: 2017-08-21 Last updated: 2018-05-04Bibliographically approved

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Huang, FeiIvandic, MonikaJuhlin, Christopher

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