My research is part of the RETURN project, which focuses on unlocking the potential for dense-CO2 storage in depleted oil and gas reservoirs. Large depletion can be accompanied by strong stress concentration and hysteresis effect upon re-pressurisation. I am investigating the immediate and intermediate effects of reservoir re-pressurization and pressure cycling on the mechanical properties of the reservoir material. Moreover, the low-pressure condition in depleted reservoirs can results in substantial cooling and potential freezing of the well and near-well region upon CO2 injection, due to the adiabatic expansion and associated phase alteration of CO2. Within my research, I am also investigating the effects of thermal cycling, including freeze-thaw cycles, on the mechanical and transport properties of both the reservoir and caprock materials. Ultimately, my goal is to develop constitutive models that describe the transport and mechanical behavior of these materials following thermal and pressure cycling, which can then be integrated into reservoir models to optimize the most efficient long-term storage strategies.