Change search
ReferencesLink to record
Permanent link

Direct link
Application of the Reflection SeismicMethod in Monitoring CO2 Injection in aDeep Saline Aquifer in the Baltic Sea
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences.
2013 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Time-lapse reflection seismic methods have proven effective fordetecting and monitoring the injection and spreading of geologicallystored CO2. These methods are based on interpreting changes in themedia’s elastic properties that result from replacing the native salinewater by the injected CO2, which in turn affects the seismic velocitiesof the media. Since applications of these methods in the field areexpensive, and the interpretation process is time consuming, pre-studyinvestigations should be done in order to determine whether or notreflection seismic surveys can successfully be applied to monitor theCO2 plume in the case of interest.In the present study, CO2 injection and migration in a deep salineaquifer based on a structure situated below the south-western part ofthe Baltic Sea was modeled. To determine the CO2 saturationdistributions at different times, the injection was numericallysimulated using TOUGH2/ECO2N. A radial-symmetric model withhomogeneous and isotropic properties was assumed and two differentinjection rates were studied, with the results analyzed at differenttimes after the start of the injection.The saturation and density values resulting from the TOUGH2simulation were converted to seismic velocities using the Biot-Gassmann model. A synthetic velocity model was built based on bothTOUGH2 and Biot-Gassmann models and synthetic seismic responsefields before and after injection were generated. The results show thatthe amplitude changes in the seismic response are detectable even forsmall amounts of injected CO2, while noticeable signs of velocitypushdown, as a signature of the CO2 substitution, could only beobserved if the injection rate is high enough.

Place, publisher, year, edition, pages
, Examensarbete E1, 30 hp, Hydrologi, ISSN 1650-6553 ; 263
National Category
Oceanography, Hydrology, Water Resources
URN: urn:nbn:se:uu:diva-200179OAI: diva2:622400
Educational program
Master Programme in Earth Science
Available from: 2013-05-21 Created: 2013-05-21 Last updated: 2013-05-23Bibliographically approved

Open Access in DiVA

fulltext(3512 kB)543 downloads
File information
File name FULLTEXT01.pdfFile size 3512 kBChecksum SHA-512
Type fulltextMimetype application/pdf

By organisation
Department of Earth Sciences
Oceanography, Hydrology, Water Resources

Search outside of DiVA

GoogleGoogle Scholar
Total: 543 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Total: 2283 hits
ReferencesLink to record
Permanent link

Direct link