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Article Dans Une Revue Applied Geochemistry Année : 2014

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

Résumé

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.

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Géochimie
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Dates et versions

hal-01080747 , version 1 (06-11-2014)

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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, 2014, 46, pp.95-108. ⟨10.1016/j.apgeochem.2014.02.008⟩. ⟨hal-01080747⟩
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