4.6 Conclusions

Reactive transport modelling offers a wide set of useful tools for assessing the geologic storage site in different operational phases: pre-injection, during injection and post-injection. Inputs for reactive transport modelling depend mainly on the availability of data, on the geological model and the regulations. Multiple simulations should be performed based on different geostatistical realisations of the geology in order to allow estimation of variability of the key output parameters, and the time span for simulations should extend beyond the anticipated injection period and post-injection period prior to the transfer of responsibility. Very interesting and useful guidelines and best practices are available such as the CO2QUALSTORE, 2009 and the NETL, 2011 Best Practises for Risk Analysis and Simulation for Geologic Storage of CO2.

Case studies show that reactive transport modelling provides valuable insights for analysing and assessing the dynamic behaviours of injected CO2, identifying and characterising potential storage sites, and managing injection performance and reducing COsts (Xiao et al., 2009).