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Most studies on CO 2  emissions reduction strategies that address the ‘two-degree scenario’ (2DS) recognize a significant role for CCS. For CCS to be effective, it must be deployed globally on both existing and emerging energy systems. For nations with large-scale emissions, offshore geologic CO 2  storage provides an attractive and efficient long-term strategy. While some nations are already developing CCS projects using offshore CO 2  storage resources, most geographic regions have yet to begin. This paper demonstrates the geologic significance of global continental margins for providing broadly-equitable, geographically-relevant, and high-quality CO 2  storage resources. We then use principles of pore-space utilization and subsurface pressure constraints together with analogs of historic industry well deployment rates to demonstrate how the required storage capacity can be developed as a function of time and technical maturity to enable the global deployment of offshore storage for facilitating 2DS. Our analysis indicates that 10–14 thousand CO 2  injection wells will be needed globally by 2050 to achieve this goal.

Maturing global CO2 storage resources on offshore continental margins to achieve 2DS emissions reductions