3.4 Conclusions

Understanding the fate of the injected CO2 in the storage reservoir is a complex task. One of the methods that can be used to evaluate the mechanisms that control the behaviour of CO2 is flow modelling. The computer simulation technology developed for the petroleum industry has been used for geological CO2 storage as well. However, the requirement to develop new simulators that can handle the flow and transport mechanisms specific to CO2 storage mediums and scenarios is unavoidable. Considerable progress has been made in modelling the spread of a CO2 plume in the reservoir, which could be used in every phase of a CO2 storage project. The use of the simulators to model current large-scale projects gives fruitful results and, of course, new challenges for the prediction of plume behaviour.