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In the future, the development of a zero-carbon economy will require large-scale hydrogen storage. This article addresses hydrogen storage capacities, a critical issue for large-scale hydrogen storage in geological structures. The aim of this paper is to present a methodology to evaluate the potential for hydrogen storage in depleted natural gas reservoirs and estimate the capacity and energy of stored hydrogen. The estimates took into account the recoverable reserves of the reservoirs, hydrogen parameters under reservoir conditions, and reservoir parameters of selected natural gas reservoirs. The theoretical and practical storage capacities were assessed in the depleted natural gas fields of N and NW Poland. Estimates based on the proposed methodology indicate that the average hydrogen storage potential for the studied natural gas fields ranges from 0.01 to 42.4 TWh of the hydrogen energy equivalent. Four groups of reservoirs were distinguished, which differed in recovery factor and technical hydrogen storage capacity. The issues presented in the article are of interest to countries considering large-scale hydrogen storage, geological research organizations, and companies generating electricity from renewable energy sources. [ABSTRACT FROM AUTHOR]

Abstract: It was showed results of CO2 storage capacity estimation in aquifers and hydrocarbon deposits in Poland, which were achieved within realization of 6 FP project EU GeoCapacity. CO2 storage capacity was calculated in Mesozoic aquifers at regional scale (Lower Cretaceous–7,647 Mt, Lower Jurassic–43,826 Mt, Lower Triassic–26,494 Mt) and for selected 18 geological structures (3,522 Mt). Storage capacity calculated for Polish hydrocarbon fields, using an assumption of 1:1 volumetric replacement of hydrocarbons with supercritical CO2, is 764.32 Mt and storage capacities of particular fields are diverse. [Copyright &y& Elsevier]