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Understanding mechanisms of oil mobilization of tight matrix during CO 2  injection is crucial for CO 2  enhanced oil recovery (EOR) and sequestration engineering design. In this study exposure behavior between CO 2  and tight rock of the Ordos Basin has been studied experimentally by using nuclear magnetic resonance transverse relaxation time (NMR T 2 ) spectrum and magnetic resonance imaging (MRI) under the reservoir pressure and temperature. Quantitative analysis of recovery at the pore scale and visualization of oil mobilization are achieved. Effects of CO 2  injection, exposure times and pressure on recovery performance have been investigated. The experimental results indicate that oil in all pores can be gradually mobilized to the surface of rock by CO 2  injection. Oil mobilization in tight rock is time-consuming while oil on the surface of tight rock can be mobilized easily. CO 2  injection can effectively mobilize oil in all pores of tight rock, especially big size pores. This understanding of process of matrix exposed to CO 2  could support the CO 2  EOR in tight reservoirs.

Measurement and Visualization of Tight Rock Exposed to CO2 Using NMR Relaxometry and MRI