Pore-Scale CO₂-Brine Coreflood X-Ray CT Dataset (CO2XCT)

This dataset provides high-resolution, pore-scale imaging data from supercritical CO₂ (scCO₂)-brine core-flooding experiments conducted under realistic subsurface reservoir conditions. Designed to advance research in geologic carbon sequestration and subsurface gas storage, the dataset includes 3D X-ray microcomputed tomography images—both raw and segmented - captured at 25 μm resolution during equilibrium states of drainage and imbibition. Accompanying metadata include continuous flow rate and pressure measurements, fluid saturation values, and morphological descriptors such as phase connectivity. The experiments utilized scCO₂-equilibrated brine to minimize mass-transfer effects, and dual-quality image sets at residual CO₂ saturation offer unique opportunities for testing denoising and rapid imaging techniques. By providing curated, open-access data with detailed pressure histories and image segmentations, this resource supports multiphysics model validation, image processing algorithm development, and other innovations in multiphase transport in porous media.