Optimum geological storage depths for structural H2 geo-storage

H-2 geo-storage has been suggested as a key technology with which large quantities of H-2 can be stored and withdrawn again rapidly. One option which is currently explored is H-2 storage in sedimentary geologic for-mations which are geographically widespread and potentially provide large storage space. The mechanism which keeps the buoyant H-2 in the subsurface is structural trapping where a caprock prevents the H-2 from rising by capillary forces. It is therefore important to assess how much H-2 can be stored via structural trapping under given geo-thermal conditions. This structural trapping capacity is thus assessed here, and it is demonstrated that an optimum storage depth for H-2 exists at a depth of 1100 m, at which a maximum amount of H-2 can be stored. This work therefore aids in the industrial-scale implementation of a hydrogen economy.