Micromodel investigations of CO2 exsolution from carbonated water in sedimentary rocks

► Bubble formation, morphology, and mobility are characterized in CO2 exsolution. ► Strong influence of pore-geometry is found on bubble growth and evolution. ► Snap-off contributes to the transport of the dispersed exsolved gas phase. ► Critical gas saturation is defined by the pervasion of snap-off events. ► Low water and gas mobility in exsolution is explained by dispersed gas formation.