Experimental simulation of H coinjection via a high-pressure reactor with natural gas in a low-salinity deep aquifer used for current underground gas storage.

If dihydrogen (H) becomes a major part of the energy mix, massive storage in underground gas storage (UGS), such as in deep aquifers, will be needed. The development of H requires a growing share of H in natural gas (and its current infrastructure), which is expected to reach approximately 2% in Europe. The impact of H in aquifers is uncertain, mainly because its behavior is site dependent.