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The CO 2  miscible flooding in Baikouquan tight formation was thoroughly investigated under reservoir condition of 37 MPa and 89 °C. The low-field nuclear magnetic resonance (NMR) system was used to measure the real time oil saturation under high-temperature and high-pressure environment. The results show that the recovery factors of large, medium and small pores are 66.18%, 45.71%, and 12.71%, respectively. A complementary investigation of CO 2 –brine–rock interaction was performed, which indicate that the small pore throats blockage during the displacement process is the main reason for low recovery in small pores.

Quantitative analysis of CO 2 miscible flooding in tight formation at pore scale applying nuclear magnetic resonance