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Titel |
Post-injection feasibility study with the reflectivity method for the Ketzin pilot site, Germany (CO2 storage in a saline aquifer) |
VerfasserIn |
Alexandra Ivanova, Thomas Kempka, Fei Huang, Magdalena Diersch [Gil], Stefan Lüth |
Konferenz |
EGU General Assembly 2016
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Medientyp |
Artikel
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Sprache |
en
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Digitales Dokument |
PDF |
Erschienen |
In: GRA - Volume 18 (2016) |
Datensatznummer |
250126942
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Publikation (Nr.) |
EGU/EGU2016-6738.pdf |
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Zusammenfassung |
3D time-lapse seismic surveys (4D seismic) have proven to be a suitable technique
for monitoring of injected CO2, because when CO2 replaces brine as a free gas it
considerably affects elastic properties of porous media. Forward modeling of a 4D seismic
response to the CO2-fluid substitution in a storage reservoir is an inevitable step
in such studies. At the Ketzin pilot site (CO2 storage) 67 kilotons of CO2 were
injected into a saline aquifer between 2008 and 2013. In order to track migration of
CO2 at Ketzin, 3D time-lapse seismic data were acquired by means of a baseline
pre-injection survey in 2005 and 3 monitor surveys: in 2009, 2012 and in 2015 (the 1st
post-injection survey). Results of the 4D seismic forward modeling with the reflectivity
method suggest that effects of the injected CO2 on the 4D seismic data at Ketzin
are significant regarding both seismic amplitudes and time delays. These results
prove the corresponding observations in the real 4D seismic data at the Ketzin pilot
site. But reservoir heterogeneity and seismic resolution, as well as random and
coherent seismic noise are negative factors to be considered in this interpretation.
Results of the 4D seismic forward modeling with the reflectivity method support
the conclusion that even small amounts of injected CO2 can be monitored in such
post-injected saline aquifer as the CO2 storage reservoir at the Ketzin pilot site
both qualitatively and quantitatively with considerable uncertainties (Lüth et al.,
2015).
Reference:
Lueth, S., Ivanova, A., Kempka, T. (2015): Conformity assessment of monitoring and
simulation of CO2 storage: A case study from the Ketzin pilot site. - International Journal of
Greenhouse Gas Control, 42, p. 329-339. |
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