摘要
Majority of geologic CO_(2) storage sites for currently operated large-scale integrated carbon capture and storage projects(LSIPs)in operation around the world are depleted oil fields that have been undergone significant depletion and re-pressurization prior to injection of captured CO_(2).A better understanding of any of the implications associated with past depletion and re-pressurization histories to“out of injection zone”migration of injected CO_(2) can help in making monitoring strategies significantly more effective.Being the geologic CO_(2) storage demonstration sites for two most active LSIPs in the US,the West Hastings and the Bell Creek Oil Fields are the main focus of present study.The monitoring technologies that have been used/deployed/tested at both the normally pressured West Hastings and the subnormally pressured Bell Creek storage sites appear to adequately address any of the potential“out of zone migration”of injected CO_(2) at these sites.It would be interesting to see if any of the collected monitoring data at the West Hastings and the Bell Creek storage sites could also be used in future to better understand the viability of initially subnormally pressured and subsequently depleted and re-pressurized oil fields as secure geologic CO_(2) storage sites with relatively large storage CO_(2) capacities compared to the depleted and re-pressurized oil fields that were initially discovered as normally pressured.
