Rangley

The Rangely Field CO₂ storage project is a long-running enhanced oil recovery (EOR) and geologic sequestration operation located in northwestern Colorado and operated within the Rangely oil field under an EPA Subpart RR monitoring, reporting, and verification (MRV) plan. The field was originally discovered in 1933, with CO₂ flooding initiated in 1986 to enhance oil recovery and maintain reservoir pressure. Injected CO₂ is stored within the Weber Formation, a clean eolian quartz sandstone reservoir sealed by overlying Phosphoria/Park City units, forming a structurally trapped dome-shaped reservoir. As of the end of 2022, approximately 122.76 million tonnes of CO₂ had been injected into Rangely Field, with significant volumes recycled through production operations typical of CO₂-EOR projects. Forecast modeling indicates approximately 51.2 million tonnes of CO₂ may be permanently stored during the modeled injection period through around 2060, representing roughly 35.7% of the theoretical storage capacity of the reservoir.