CO2 intrusion in freshwater aquifers: Review of geochemical tracers and monitoring tools, classical uses and innovative approaches

Abstract : This review of applied geochemical methods for monitoring CO2 leakage focuses on shallow freshwater aquifers overlying CO2 storage areas. Geochemical tracer tools form a set of geochemical techniques, each of which is examined in this review and classified according to its sensitivity in CO2 detection. The pur- pose of any monitoring programme is to be able to provide sufficient information to enable site remedi- ation in the case of unforeseen events and also to enable a satisfactory site closure strategy. Therefore, CO2 monitoring tools must be able to detect a precursor signal or an early warning signal of leakage asso- ciated with potentially minute geochemical modifications (i.e. associated with small amounts of CO2). We have classified the monitoring/tracing tools into two groups: (A) direct indicators of the CO2 itself, and (B) indirect indicators (i.e. reaction products) of the presence of CO2 that take into account displace- ment of the chemical equilibria under the conditions imposed by CO2 dissolution. Included in these tools are isotopic monitoring tools that are very sensitive to physico-chemical changes and can therefore pro- vide early CO2 detection. These tools include carbon and oxygen isotope systematics that are convention- ally used with respect to CO2 in the Carbon Capture and Storage (CCS) context. Finally, the review offers new perspectives on sensitive indirect detection methods using isotopes that are ‘non-traditional’ in the sense that they have not yet been applied to the field of CO2 geological storage. The complementarity of these geochemical methods provides a powerful monitoring strategy.
Keywords : co2 monitoring
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https://hal-mines-paristech.archives-ouvertes.fr/hal-01080747
Contributeur : Vincent Lagneau <>
Soumis le : jeudi 6 novembre 2014 - 10:42:10
Dernière modification le : vendredi 10 mai 2019 - 13:54:16

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Pauline Humez, Julie Lions, Philippe Négrel, Vincent Lagneau. CO2 intrusion in freshwater aquifers: Review of geochemical tracers and monitoring tools, classical uses and innovative approaches. Applied Geochemistry, Elsevier, 2014, 46, pp.95-108. ⟨10.1016/j.apgeochem.2014.02.008⟩. ⟨hal-01080747⟩

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