Impact potential of hypersaline brines released into the marine environment for CCS reservoir pressure management

• The potential impact from the disposal of hypersaline brines into ocean is assessed. Investigated as reservoir pressure management for Carbon Capture and Storage. Modelled using sophisticated high-resolution hydrodynamic models. We find that dispersion acts to dilute disposed brine rapidly. method has a significant influence on dispersal. environmental arising possible part Storage assessed models first time, investigating several industry guided scenarios. Although characteristics some in their undiluted form would have high potential, we hydrodynamically active region like North Sea rapidly, even worst case approach, such footprint (area exposed environmentally damaging salinity or temperature) small, measured 10?s meters depending release scenario site specific data water contaminants along with in-situ conditions currents mixing. dispersal, released nearer sea surface disperse more compared at seabed. Hence consideration height recommended further limit potential.