The role of microscopic displacement dynamics for underground hydrogen versus natural gas storage in fractured reservoirs

This dataset contains X-ray CT images from Experiment 1 of the study titled "Drainage, Imbibition, and Trapping Behavior of Hydrogen versus Methane in Fractured Limestone from a Natural Gas Storage Aquifer in Belgium." Experiment 1 was conducted on a fractured reservoir rock sample with a diameter of 6 mm, a fracture width of 130 µm, and a length of  22 mm. Due to the limited field of view of the scanner, the sample was scanned in four parts—top, mid1, mid2 and bottom—for the dry phase. The dry scans are merged and used to obtain average fracture width, fracture permeability and relative roughness index. With continuous fluid injectuib, pressurization, fracture undergoes slight change in its size so water phase scan taken at the end of experiment is used to compare the multiphase and single phase scans.  Fluids (gas or brine) were injected from the bottom of the vertically mounted sample, and multiphase flow scans were performed exclusively on the mid2 part (middle of the sample length). The dataset includes experiments for drainage and imbibition using hydrogen, methane, and a 50:50 hydrogen-methane mixture (based on partial pressure).