[H-SC07] CCUS (Carbon Dioxide Capture, Utilization, and Storage) for Climate Mitigation

[HSC07-P03] Study of CO2 Plume Monitoring by Pressure Transient Analysis (PTA) in Saline Aquifer CCS

*Kenichi KUMAGAI¹, Yuki Hiura¹, Hiromi Kamata¹, Sho Hirose² (1.JGI, Inc., 2.Japan Petroleum Exploration Co., Ltd.)

Keywords:Carbon dioxide Capture and Storage (CCS), Monitoring, CO2 plume, Numerical simulation, Pressure Transient Analysis (PTA)

When CO2 is injected into a saline aquifer, the behavior of the CO2 plume must be monitored and controlled to ensure that it does not leak to the surface or seafloor and that it does not reach faults that may become active. Seismic survey is the strongest and most reliable tool for such monitoring, but it is more expensive than other monitoring methods. Therefore, a numerical simulator is used to simulate the fall-off after CO2 injection into the aquifer, and pressure transient analysis is performed using the well bottom-hole pressure and temperature profiles to check the effects of different injection fluids, increased injection volume, and physical properties associated with pressure and temperature changes on the analysis results, so that periodic fall-off tests will be used to determine the spreading of the CO2 plume and the possibility of optimizing the frequency of seismic surveys based on the results.