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Explore the critical implications of hydrogen-carbonate interactions for underground hydrogen storage through this 37-minute conference talk by Dr. Ritabrata Dobe from the University of Liverpool. Examine how molecular hydrogen, produced by natural fluid-rock interactions, affects the rheological properties of carbonate minerals and assess the feasibility of using carbonate reservoirs for long-term hydrogen storage. Discover integrated research findings from field studies, petrographic analysis, microstructural examination, and thermodynamic modeling that document high-pressure hydrogen origin and transport along a serpentinite-hosted shear zone in Alpine Corsica, France. Learn how thermodynamic models reveal that hydrogen presence modifies carbonate phase stability under subduction conditions, causing progressive replacement of dolomite by calcite, graphite, and magnetite as hydrogen concentration increases. Understand the rheological consequences of hydrogen infiltration, including the transition from brittle/semi-brittle to viscous deformation and the transformation of dolomite to calcite, with transformation efficiency dependent on hydrogen percolation rates. Gain insights into methods for identifying fossilized hydrogen-carbonate reactivity that could inform site assessment for prospective underground hydrogen storage locations, and appreciate how hydrogen-rich fluid infiltration significantly alters carbonate rheology through enhanced reactivity and phase transitions.
