We have used high-pressure high-temperature equipment to image trapped (residual) super-critical CO2 in carbonate and sandstone systems with a voxel size of around 6.5µm. A residual saturation and trapping capacity (Sor) was obtained for each rock type, showing that, in all cases, a significant proportion of the scCO2 was trapped. A size analysis is performed on the residual phase clusters, finding results broadly consistent with percolation theory. This analysis is compared to the volumetric connectivity of networks extracted from dry scans rock types examined. We show techniques which allow for the extraction of larger scale parameters, such as contact angle, capillary pressure and specific interfacial area from higher resolution (2µm voxel size) pore-scale images of fluid distribution. We also demonstrate the usage of extremely bright synchrotron sources to obtain results from dynamic displacements with a time resolution of around 30 seconds. This allows for the first time to analyse fundamental dynamic processes of drainage and imbibition at the pore scale at conditions representative of subsurface flow.


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