Which field has been injecting CO2 for storage since 1996?

Which field has been injecting CO2 for storage since 1996?

• A. Sleipner West
• B. Snøhvit
• C. Troll A
• D. Ekofisk

Answer: (C)

The key idea is the first large-scale, commercial use of carbon capture and storage (CCS) offshore. Sleipner West began injecting CO2 back into a deep saline formation beneath the North Sea in 1996, making it the earliest ongoing CO2 storage project. The CO2 is separated from natural gas at the Sleipner field and then pumped underground into the Utsira Sand reservoir, effectively storing it rather than releasing it to the atmosphere. This setup demonstrated that long-term underground storage of CO2 is technically feasible at commercial scale. The other fields listed have different CO2-related roles or started storage operations later, so they aren’t the field that began CO2 storage in 1996.

The key idea is the first large-scale, commercial use of carbon capture and storage (CCS) offshore. Sleipner West began injecting CO2 back into a deep saline formation beneath the North Sea in 1996, making it the earliest ongoing CO2 storage project. The CO2 is separated from natural gas at the Sleipner field and then pumped underground into the Utsira Sand reservoir, effectively storing it rather than releasing it to the atmosphere. This setup demonstrated that long-term underground storage of CO2 is technically feasible at commercial scale.

The other fields listed have different CO2-related roles or started storage operations later, so they aren’t the field that began CO2 storage in 1996.