Abstract
Carbon capture and storage site (CCS) are subjected to specification relative to security towards population but also toward the environment. As consequences, it has been suggested that a maximum of 0.01 % per year of CO2 leakage would be the maximum amount of CO2 tolerated to leak from a CCS site (White et al., 2003; Oldenburg et al., 2003). Therefore geochemical tools have to be developed to monitor and detect CO2 leakage from the near surface and the shallow unsaturated zone (vadose zone). They must have the potential to precisely detect and quantify leaks, and discriminate natural signal from anthropogenic ones.The aim of this study is to understand the attenuation mechanism in the carbonate vadose zone and to estimate the processes of transport and reaction. This works describes the results of a release experiment in the shallow surface of the vadose zone.
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