INVESTIGATING THE EASTERN GULF OF MEXICO FOR POTENTIAL GEOLOGIC STORAGE OF CO2
Phase I is providing an overview of the basic geologic framework of the SOSRA region, identifying potential storage units with robust seals, and defining the key planning areas. Our focus here is on the potential targets in the EGOM. Preliminary assessments offshore of Alabama and Mississippi indicate that offshore storage capacity of Miocene strata exceeds 200 Gt. These shallow targets need to be assessed for sufficient seals to contain sequestered CO2. Deeper strata may have other challenges. For example, strata deeper than 3,000 m are geopressured. Therefore, efforts are focusing on Cretaceous-Oligocene strata between depths of 1,000 and 3,000 m. Salt basins in the northwest part of the study area contain large salt-tectonic structures hosting a broad array of storage prospects. The West Florida Shelf spans the southeastern part of the study. The shelf can be characterized as a broad carbonate bank and structurally simple compared to the salt basins.
Phase II, now underway, will include a robust characterization of offshore CO2 storage reservoirs and seals, as well as a probabilistic assessment of storage capacity.