GEOCHIMIC MONITORING OF A GEOLOGICAL CO2 STORAGE USING ASSOCIATED RARE GAS RATIOS

摘要

The present invention relates to a method for monitoring a geological storage of CO, in which the following steps are carried out: the contents of CO and rare gases contained in a geological aquifer above the coverage of a future storage of carbon are analyzed; CO, the rare gas contents associated with the injected CO are analyzed, the rocks constituting the said cover are characterized, and a leakage of CO and noble gases from the storage and crossing the cover towards the said upper geological layer is modeled; a threshold of at least one ratio of rare gases corresponding to a CO leakage rate; - a ratio of rare gases present in the geological layer surmounting said storage is measured, and compared with said threshold, and the leakage rate is determined; of CO.