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Geological storage of CO 2 is nowadays internationally considered as the most effective method for greenhouse gas emission mitigation, in order to minimize its effects on the global climatology. One of the main options is to store the CO 2 in deep saline aquifers at more than 800 m depth, because it achieves its supercritical state. Among the most important aspects concerning the performance assessment of a deep CO 2 geological repository is the evaluation of the CO 2 leakage rate from the chosen storage geological formation. Therefore, it is absolutely necessary to increase the knowledge on the interaction among CO 2 , storage and sealing formations, as well as on the flow paths for CO 2 and the physico-mechanical resistance of the sealing formation. Furthermore, the quantification of the CO 2 leakage rate is essential to evaluate its effects on the environment. One way to achieve this objective is to study of CO 2 leakage on natural analogue systems, because they can provide useful information about the natural performance of the CO 2 , which can be applied to an artificial CO 2 geological storage.This work is focused on the retention capacity of the cap-rock by measuring the diffuse soil CO 2 flux in a site selected based on: i) the presence of a natural and deep CO 2 accumulation; ii) its structural geological characteristics; and iii) the nature of the cap- The results obtained allow to conclude that the geological sealing formation of the basin seems to be appropriate to avoid CO 2 leakages from the storage formation.

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