CRANFIELD PROJECT Lower Tuscaloosa Formation, Natchez, Mississippi Southeast Regional Carbon Sequestration Partnership

CRANFIELD PROJECT Lower Tuscaloosa Formation, Natchez, Mississippi Southeast Regional Carbon Sequestration Partnership NATIONAL ENERGY TECHNOLOGY LABORATORY July 2017 BACKGROUND The Southeast Regional Carbon Sequestration Partnership (SECARB) Cranfield Project has a goal of safely demonstrating largescale, long-term CO₂ injection and storage in a CO₂ -enhanced oil recovery (EOR) and associated saline reservoir—activities that hold significant promise for future development within the southeast United States. In July 2008, Denbury Onshore, LLC, began CO₂ -EOR operations at the Cranfield oilfield located east of Natchez, Mississippi. The SECARB Cranfield Team, led by the Southern States Energy Board and its partners, the Gulf Coast Carbon Center of the Bureau of Economic Geology at the University of Texas at Austin, deployed a variety of monitoring, verification, accounting (MVA), and assessment technologies focused on a commercial CO₂ injection environment, and collected data for long-term carbon capture and storage (CCS) analysis. The CO₂ is injected into the lower Tuscaloosa Formation, a large and regionally extensive saline formation with the potential to hold centuries of CO₂ emissions in the Southeast United States. In August 2009, the project team met a milestone by monitoring injections of more than 1 million metric tons of CO₂ . As of March 2015, the project team monitored injection and storage of more than 5 million metric tons of CO₂ at the site.