The influence of water-rock reactions and O isotope exchange with CO2 on water stable isotope composition of CO2 springs in SE Australia

Rūta Karolytė, Gareth Johnson, Sascha Serno, Stuart M. V. Gilfillan

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Abstract

Monitoring injected CO2 in CCS sites using oxygen isotopes of water has been demonstrated in field and laboratory experiments. Here, we examine natural CO2-rich springs in the Daylesford-Hepburn region, South East Australia, which show water 18O depletion compared to local precipitation. Geochemical modelling shows that water-rock reactions are unlikely to have a significant effect on the observed δ18O values, which can only be explained by isotopic exchange with CO2. The water δ18O shift can be used for monitoring CO2 impact on shallow groundwater aquifers, provided that there is sufficient CO2 and distinction between water and CO2 δ18O values exists.
Original languageEnglish
Pages (from-to)3832-3839
Number of pages8
JournalEnergy Procedia
Volume114
DOIs
Publication statusPublished - 18 Aug 2017
Event13th Conference on Greenhouse Gas Control Technologies (GHGT) - Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
Duration: 14 Nov 201618 Nov 2016
http://www.ghgt.info/ghgt-13

Keywords

  • water-rock reactions
  • CCS
  • natural tracers
  • monitoring
  • O isotopes
  • natural analogues

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