This project will characterise the interactions that CO2 could have with the intraformational seals within the Gippsland Basin targeted for CO2 storage by the CarbonNet project. As described by Gibson-Poole et al. (2008) these intraformational layers consist of siltstones, shales and coals some of which are believed to be laterally extensive. The project will perform a series of experiments which will characterise the CO2 seal behaviour of the coals of these intra-formational layers. The project will use a core flooding technique that is directly analogous to what would happen during geological storage. This technique will estimate the CO2 entry pressure and thus the CO2 column height below the coals, characterising their seal potential at reservoir pressure, temperature and average triaxial stress.