10.5880/GFZ.3.1.2021.004 eng dataset GFZ German Research Centre for Geosciences datapub@gfz-potsdam.de http://www.gfz-potsdam.de Helmholtz-Centre Potsdam - GFZ German Research Centre for Geosciences Helmholtz-Centre Potsdam - GFZ German Research Centre for Geosciences pointOfContact 2021-05-11 urn:ogc:def:crs:EPSG:4326 Dataset on laboratory pilot-scale simulations: CH4-CO2 exchange in gas hydrate-bearing sediments within GFZ´s Large Reservoir Simulator (LARS) 2021-05-11 revision doi:10.5880/GFZ.3.1.2021.004 Heeschen, Katja GFZ German Research Centre for Geosciences, Potsdam, Germany author Deusner, Christian GEOMAR Helmholtz Centre for Ocean Research Kiel, Germany author Spangenberg, Erik GFZ German Research Centre for Geosciences, Potsdam, Germany author Priegnitz, Mike GFZ German Research Centre for Geosciences, Potsdam, Germany author Schicks, Judith M. GFZ German Research Centre for Geosciences, Potsdam, Germany author LARS - LArge Reservoir Simulator (GFZ German Research Centre for Geosciences, Germany) GFZ German Research Centre for Geosciences, Potsdam, Germany originator GFZ Data Services publisher The guest molecule exchange of methane (CH4) by carbon dioxide (CO2) in natural gas hydrate reservoirs is considered a desirable possibility to produce CH4 and at the same time sequester CO2. So far process evaluation is commonly based on CH4-CO2 exchange yields and rates from small- or medium-scale experiments in partly water-saturated sediments, both of which does not represent natural conditions. The experiments are presented in detail in a currently submitted manuscript by Heeschen et al. (2019). The presented data originate from two large-scale experiments (210 L) investigating the efficiency of the CH4-CO2 exchange under fully water-saturated natural reservoir conditions. For details on the equipment and the methods used see: Priegnitz et al., 2013; Schicks et al., 2011; Spangenberg et al., 2014. The reservoir conditions were 13 MPa and 8 °C, and the gas hydrate saturation in the sand (Sh) was 50% of the pore space. The gas hydrate was formed from dissolved CH4 only. About 50 kg heated CO2 was injected 1) discontinuously with intermediate soaking periods (E1) and 2) continuously (E2). In both cases, the CO2 injection periods were followed by a discontinuous depressurization of the reservoir. The experiments demonstrate the importance of fluid migration patterns, heat transport, sample inhomogeneity, reaction kinetics, and secondary gas hydrate formation in water-saturated sediments. Methane production yields of 5% were small in both experiments during the injection periods, whereas controlled depressurization following the injection of CO2 into a CH4 hydrate reservoir could be a possible approach for the production of CH4 from a gas hydrate reservoir. However, the success of this method strongly depends on the distribution of CO2, and the availability and distribution of residual pore water. Complete Heeschen, Katja GFZ German Research Centre for Geosciences, Potsdam, Germany katjah@gfz-potsdam.de pointOfContact Spangenberg, Erik GFZ German Research Centre for Geosciences, Potsdam, Germany erik@gfz-potsdam.de pointOfContact SUGAR project gas hydrates EARTH SCIENCE > SOLID EARTH > ROCKS/MINERALS/CRYSTALS > GAS HYDRATES NASA/GCMD Earth Science Keywords publication CC BY 4.0 CC BY 4.0 10.1021/acs.energyfuels.0c03353 DOI IsSupplementTo 10.1029/2005jb003734 DOI Cites 10.1063/1.4825372 DOI Cites 10.3390/en4010151 DOI Cites 10.1021/je5005609 DOI Cites https://www.gfz-potsdam.de/en/section/geoenergy/infrastructure/lars/ URL References eng geoscientificInformation http://doi.org/10.5880/GFZ.3.1.2021.004 WWW:LINK-1.0-http--link Data Access - DOI Data Access - DOI information