Subsurface storage of CO2 is always associated with an excess pressure in the reservoir and one of the primary environmental risks is a pressure-driven leakage of CO2 from a storage formation. We consider in this work the problem of CO2 injection well placement in the framework of risk mitigation. The injector is positioned in order to minimize the risk of CO2 leakage through a caprock of the storage reservoir due to overpressure. We propose a new method for an injection well placement optimization under uncertainty. The method is based on a response surface model approach. The reservoir overpressure is approximated as a function of main uncertain parameters and the well coordinates during the injection period . The proposed approach allows to significantly reduce the required number of simulations and the total computational time.


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