Characterization of pozzolan-amended wellbore cement exposed to CO2 and H2S gas mixtures under geologic carbon storage conditions.

Highlights: [•] The effects of CO₂ and H₂S attack on pozzolan-amended wellbore cement under geologic carbon storage conditions are examined. [•] Iron-rich particles from pozzolan additives make pozzolan-amended wellbore cement prone to H₂S attack. [•] 35 pozzolan vol% wellbore cement is more resistant to CO₂ and H₂S attack than 65 pozzolan vol% wellbore cement. [•] CO₂ and H₂S alteration of pozzolan-amended wellbore cement does not indicate mechanical strength loss. [Copyright &y& Elsevier]