Jilin Oilfield CO2‑EOR

The Jilin Oilfield CO₂-EOR project is located in Jilin Province, northeast China, within the Songliao Basin, one of China’s largest onshore sedimentary basins. Operated by PetroChina (CNPC), the project is among China’s earliest and largest integrated CO₂ utilization and storage developments, combining anthropogenic CO₂ capture with tertiary oil recovery. Production targets primarily Cretaceous-age sandstone reservoirs characterized by fluvial-deltaic depositional systems with stratigraphic and structural trapping. The field transitioned from conventional primary production and waterflooding to miscible CO₂ flooding to increase recovery from mature reservoirs and demonstrate large-scale carbon capture, utilization, and storage (CCUS). CO₂ is sourced from nearby industrial facilities, including natural gas processing and petrochemical operations, transported by pipeline, and injected via Class II-equivalent wells into depleted reservoir intervals. Injection strategies include pattern floods and water-alternating-gas (WAG) cycles to control mobility and improve sweep efficiency in heterogeneous sandstone units. Produced CO₂ is separated and recycled through compression facilities, while retained CO₂ contributes to long-term geologic storage through structural, residual, and dissolution trapping. Jilin has been widely cited as a flagship CCUS demonstration project in China, integrating capture, transport, EOR, and monitoring programs to evaluate long-term storage performance.