| Summary: | Hydrogen (H<sub>2</sub>) is an attractive energy carrier to move, store, and deliver energy in a form that can be easily used. Field proven technology for underground hydrogen storage (UHS) is essential for a successful hydrogen economy. Options for this are manmade caverns, salt domes/caverns, saline aquifers, and depleted oil/gas fields, where large quantities of gaseous hydrogen have been stored in caverns for many years. The key requirements intrinsic of a porous rock formation for seasonal storage of hydrogen are: adequate capacity, ability to contain H<sub>2</sub>, capability to inject/extract high volumes of H<sub>2</sub>, and a reliable caprock to prevent leakage. We have carefully evaluated a commercial non-isothermal compositional gas reservoir simulator and its suitability for hydrogen storage and withdrawal from saline aquifers and depleted oil/gas reservoirs. We have successfully calibrated the gas equation of state model against published laboratory H<sub>2</sub> density and viscosity data as a function of pressure and temperature. Comparisons between the H<sub>2</sub>, natural gas and CO<sub>2</sub> storage in real field models were also performed. Our numerical models demonstrated more lateral spread of the H<sub>2</sub> when compared to CO<sub>2</sub> and natural gas with a need for special containment in H<sub>2</sub> projects. It was also observed that the experience with CO<sub>2</sub> and natural gas storage cannot be simply replicated with H<sub>2</sub>.
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