KEVIN DOME PROJECT Duperow Formation, Toole County, Montana Big Sky Carbon Sequestration Partnership

KEVIN DOME PROJECT Duperow Formation, Toole County, Montana Big Sky Carbon Sequestration Partnership NATIONAL ENERGY TECHNOLOGY LABORATORY July 2017 BACKGROUND The Big Sky Carbon Sequestration Partnership (BSCSP) is conducting a large-scale field project in north-central Montana to assess CO2 storage potential. Through this study, BSCSP aims to show that a geologic structure known as Kevin Dome in Tool County, Montana, is a safe and viable site to permanently store CO2. The dome covers more than 750 square miles and has trapped naturally occurring CO2 for millions of years. Because of this proven seal and trap integrity, the dome is an ideal site to demonstrate carbon storage. The project’s targeted injection zone is the regionally extensive carbonate Duperow formation. The project will use the Kevin Dome as a natural analog to study geochemical effects on rocks that have been exposed to CO2 for long time periods and compare them to rocks with recent exposure. Kevin Dome has a significant amount of CO2 storage space and this project will provide engineered system information on CO2 storage in a regionally representative geologic setting.