none 10.1144/SP528-2022-14 Geological Society of London Geological Society of London 1881 140041884 65091 2026061106071900227 10.1144 2026-06-11T13:08:12Z 2022-08-22T07:59:26Z 0 Geological Society, London, Special Publications Special Publications 0305-8719 2041-4927 08 18 2022 08 30 2023 528 1 Wolfgang Weinzierl GFZ German Research Centre for Geosciences, GFZ Helmholtz Centre Potsdam, Wissenschaftpark ‘Albert Einstein’, Telegrafenberg, 14473 Potsdam, Germany http://orcid.org/0000-0003-2326-0975 Merlin Ganzer GFZ German Research Centre for Geosciences, GFZ Helmholtz Centre Potsdam, Wissenschaftpark ‘Albert Einstein’, Telegrafenberg, 14473 Potsdam, Germany Dennis Rippe GFZ German Research Centre for Geosciences, GFZ Helmholtz Centre Potsdam, Wissenschaftpark ‘Albert Einstein’, Telegrafenberg, 14473 Potsdam, Germany Stefan Lüth GFZ German Research Centre for Geosciences, GFZ Helmholtz Centre Potsdam, Wissenschaftpark ‘Albert Einstein’, Telegrafenberg, 14473 Potsdam, Germany Cornelia Schmidt-Hattenberger GFZ German Research Centre for Geosciences, GFZ Helmholtz Centre Potsdam, Wissenschaftpark ‘Albert Einstein’, Telegrafenberg, 14473 Potsdam, Germany Abstract Seismic and geoelectric methods are used as complementary tools for the identification of fluid/gas effects in underground storage and production scenarios. Both methods present a different resolution. Seismic data tend to be acquired by much more dense geometrical layouts, and geoelectric acquisition as a potential field method shows information integrated over spatial distances. We present results matching seismic and electrical resistivity tomography (ERT) results from two repeat surveys performed during CO 2 storage operations at the Ketzin pilot site in Germany. The approach is based on data acquired in 2009 and 2012 at different stages of total injected CO 2 volume. Masses are obtained from the averaged change in acoustic impedance and are compared to masses inferred from inverted electrical resistivities. Archie's equation is used to obtain saturations from the ERT models. The sensitivity of the background resistivity, R 0 , as a relevant parameter in determining the mass of injected CO 2 is analysed. A specific threshold analysis based on seismic thickness by bin has been applied to investigate the matching of seismically and ERT obtained masses. Both mass estimates match comparatively well, but show inherent sensitive parameters and their corresponding impact as temporal and spatial uncertainties that may cause mass differences for the areas of investigation. 12 08 2022 08 30 2023 437 448 10.1144/SP528-2022-14 1 10.1144/crossmark-policy www.lyellcollection.org true 2022-01-26 2022-05-10 2022-05-23 2022-12-08 Horizon 2020 http://dx.doi.org/10.13039/501100007601 ENER/H2020/764531/SECURe https://www.geolsoc.org.uk/publications/lyell-collection/user-license-1-1 https://www.geolsoc.org.uk/publications/lyell-collection/user-license-1-2 https://www.geolsoc.org.uk/publications/lyell-collection/user-license-1-1 https://www.geolsoc.org.uk/publications/lyell-collection/user-license-1-2 10.1144/SP528-2022-14 https://www.lyellcollection.org/doi/10.1144/SP528-2022-14 https://www.lyellcollection.org/doi/pdf/10.1144/SP528-2022-14 https://pubs.geoscienceworld.org/UrlRedirectHandler.ashx?routename=books&chapterdoi=10.1144/SP528-2022-14&request=chapter 10.3997/2214-4609-pdb.5.H016 10.1016/j.ijggc.2014.06.023 10.1190/geo2011-0515.1 10.1190/geo2013-0422.1 10.1016/j.petrol.2015.12.007 10.1111/1365-2478.12426 Monitoring, Verification, and Accounting of CO2 Stored in Deep Geologic Formations Brown B. 2009 Brown, B., Carr, T.R. and Vikara, D. 2009. 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