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Geochemical isotopic analysis to determine the origin of H2S in the Anisian to Kimmeridgian carbonate intervals
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, Third EAGE Geochemistry Workshop, Sep 2021, Volume 2021, p.1 - 6
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Abstract
In this study, the carbon isotopic (δ13C) and chemical compositions of produced gases and liquids, as well as sulfur isotopic compositions (δ34S) of H2S and anhydrite samples collected from Lower Anisian to Upper Kimmeridgian carbonate intervals of variable H2S concentrations were measured to better assess the origin of H2S and propose possible reaction pathways. Our multi-proxy geochemical interpretations reveal that thermochemical sulfate reduction (TSR) is the dominant process responsible for generating the H2S encountered in our study area. We observed variability in sulfur isotopic fractionation between produced H2S and anhydrite, suggesting that TSR is mainly controlled by the viability of sulfate and the rate of TSR reduction.