CCUS（Carbon capture

Utilization and Storage） technology is of great significance to the green and low-carbon transformation and the realization of the “dual carbon” goal

It includes important strategies like CO

2

enhanced oil recovery（EOR） and sequestration. Jiangsu Oilfield has been focusing on CO

2

EOR to improve recovery rates in the challenging fault block reservoirs of the Subei Basin. The company has developed four unique CO

2

EOR models suitable for these complex reservoirs

featuring techniques like gravity-stable displacement. A notable achievement is the successful pilot of the methods such as “simulated horizontal well” GAGD technology in Hua-26 fault block

which

led to the one hundred thousand CCUS project tailored for such reservoirs. According to statistics

Jiangsu Oilfield has injected a total of 30.34×10

4

t of liquid CO

2

with a cumulative oil increase of 9.83×10

4

t

realizing a better production increase and economic benefits. These technical researches and tests can provide valuable insights for applying CO

2

EOR in similar complex reservoirs.