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A 980-m-deep well was cored on the Ardeche border of the Southeastern basin of France as part of the Deep Geology of France (GPF) programme. Hydrogeochemical logging was carried out during drilling, which involved the monitoring of physico-chemical parameters (pH, Eh, temperature and conductivity), and chemical parameters (concentrations of He, Rn, CO 2 , CH 4 , O 2 , Ca, Cl...