ABSTRACT:

Large-scale CO2 injection in saline aquifers will cause pressure build-up in brine far beyond the extent of CO2 plume. In this paper, we evaluate the geomechanical responses of large-scale CO2 storage in the multilayer aquifer of the Kra Al-Maru Trend in Kuwait. The site was selected after screening the whole territory of Kuwait, identifying and ranking of candidate sites for geological CO2 storage. We simulated the CO2 injection and geomechanical responses during 40 years of injection with an injection rate of 11 million tonnes/year. Results of numerical simulations show that after 40 years of injection the extent of CO2 plume is within the radial range of 4 km from the injectors, while the pressure build-up is felt up to 55 km. The largest pressure build-up of 2.3 MPa and the associated poro-elastic stress changes in the reservoir-seal pair are located within the radial range of about 5 km from the injectors. CO2 injection can induce a maximum uplift at the ground surface of 11 cm. The present-day noncritical state of stress and the magnitudes of induced stress changes suggest a low risk for containment integrity. Future studies will be required with a dedicated well to obtain core and perform detailed site characterization.

1. INTRODUCTION
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