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Experimental biogeochemical approach to the monitoring CO2 baseline fluxes at the sediment-water interface for CCS purpose

pubblicazioni - Poster

Experimental biogeochemical approach to the monitoring CO2 baseline fluxes at the sediment-water interface for CCS purpose

One of the most promising technological solutions in the CO2 Capture and Storage (CCS) is the CO2 injection in deep saline aquifers in the sub-seabed. After the storage in the sub-seabed a reliable monitoring of possible CO2 seeps is required. A useful monitoring approach (the experimental biogeochemical approach) is to determine levels and benthic fluxes of the dissolved inorganic carbon species (pCO2 and DIC) and of other connected parameters (Alkalinity, pH and δ13CDIC) in order to characterise the marine carbonate system both from a chemical point of view and the origin. The knowledge of the natural baseline levels and benthic fluxes, before the CO2 injection, will allow the comparison with data obtained after the storage operations to verify if an unexpected CO2 leakage occurs. The best method to determine dissolved benthic fluxes is the “in situ” measurement by benthic chamber deployments. The proposed experimental biogeochemical approach to the monitoring of CO2 baseline fluxes at the sediment-water interface for CCS purpose constitutes a valid method to detect possible seeps of CO2 injected in the geological formations under the sea bottom.The approach is based on the availability of numerous previous data of DIC fluxes and of other chemicals connected with the carbonate system and on the use of an up to date monitoring technology (automated benthic chamber and on deck laboratory) able to measure in situ benthic fluxes, in areas where CO2 storages can be carried out. This method could also be useful employed as an “early warning” method in case of possible failure of the CO2 storage.

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