The H2STORE project is a BMBF founded collaborative project. The main objective of the subproject at the FSU Jena are investigations on experimentally induced mineralogical-geochemical variations in potential reservoir and caprocks affected by a H2/energy storage at depths. In this experiments samples from five different stratigraphic units, representing the major siliciclastic hydrocarbon reservoir units in Germany, are analyzed. These rocks differ in their time of deposition; facies and detrital composition; burial history and therefore in their diagenetic, pressure and temperature evolution over time and formation fluid compositions. To classify the effects of a potential H2/CO2 storage at depths different kind of sample material (plugs, thin sections and rock fragments < 3.0 mm) are used for autoclave batch experiments with induced H2 (CO2) exposure under reservoir conditions (p, T, synthetic formation fluid) for time periods of 4–6 weeks. Before and after the experiments the exactly same material was analyzed by light microscopy, FE-SEM, AFM and BET. Also formation fluid analyses before and after the experiments were investigated by ICP-MS and ICP-OES. Dissolution structures on mineral surfaces, an increase of the specific surface area and element enrichment in formation fluid indicate mineral dissolution of e.g. Ca (Mg)CO3 and CaSO4 during the experiments.


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