CO2 sequestration potential in the near-future depleted CO2 reservoir: Dodan CO2 field, Turkey

Dodan field is a natural CO2 reservoir located in Siirt, Turkey. Since 1986, CO2 produced from Dodan field has been injected into Bati Raman heavy oil field of Turkey in Batman to make heavy oil mobile in porous media. CO2 sequestration into aquifers and depleted reservoirs is widely investigated to decrease CO2 emission and to slow down global warming. In this study, it is aimed to investigate whether it is possible to inject CO2 into Dodan field after depletion. The source of CO2 to be injected might be supplied from cement factories near this field. CO2 injection into Dodan field was simulated by using TOUGH+RealGasBrine. According to the output results of these simulations, CO2 injection is much more difficult and slow processes compared to CO2 production. Due to water influx into the reservoirs in Dodan field during CO2 production, approximately 61.2% of initial CO2 in-place (6.74 MMMSCM) might be injected into Dodan field in a long-term period. [Received: March 28, 2020; Accepted: November 4, 2020]

Automated summary

This study investigates the possibility of injecting CO2 into Dodan field after depletion and utilizes simulation results to show that CO2 injection is a challenging and slow process. The findings suggest that approximately 61.2% of the initial CO2 can be injected into Dodan field over a long-term period.