Pore-scale visualization of hydrogen storage in a sandstone at subsurface pressure and temperature conditions: Trapping, dissolution and wettability.

Hypothesis: Underground hydrogen (H) storage is a potentially viable solution for large-scale cyclic H storage; however, the behavior of H at subsurface pressure and temperature conditions is poorly known. This work investigates if the pore-scale displacement processes in H-brine systems in a porous sandstone can be sufficiently well defined to enable effective and economic storage operations. In particular, this study investigates trapping, dissolution, and wettability of H-brine systems at the pore-scale, at conditions that are realistic for subsurface H storage.