Role of critical gas saturation in the interpretation of a field scale CO2 injection experiment

Residual trapping of CO2, typically quantified by residual gas saturation (Sgr), is one the main mechanisms in geological CO2 storage (GCS). An important additional characteristic parameter critical (Sgc). Sgc determines at what trapped remobilizes again if increases due to exsolution from aqueous phase, rather than further injection. In present study, a pilot-scale injection experiment carried out Heletz, Israel, 2017, interpreted taking into account. With regards this experiment, delayed second arrival peak partitioning tracer could not be captured means physical models. work, hysteretic relative permeability functions were modified account for Sgc. The results showed that accounting effect during secondary drainage indeed observed peak. difference between values Sgr and Sgc, influenced both time height arrival. To our knowledge first has been considered field scale analyses related GCS. Accounting relevant where phase expansion or phase. This will happen situations pressure depletion occurs, e.g. leakage fracture zones wells possibly because management activities. findings also have implications other applications such as underground well geothermal reservoir management.