CO₂-assisted EOR technologies appear to be low-cost and eco-friendly means to boost crude oil production of dense reservoirs. The potential of CO₂ huff-n-puff process and CO₂ flooding processes have been extensively investigated in tight sandstone reservoirs, while few work has been done in tight conglomerate reservoirs, which exhibit strong micro-heterogeneity. In the present work, we quantitatively investigated the potential of CO₂ injection processes in tight conglomerate reservoirs under reservoir conditions (formation pressure 23 MPa, temperature 69 °C). High temperature and high pressure nuclear magnetic resonance (NMR) online monitoring system was used to pore-scale monitoring the change of oil saturation in-situ through NMR T₂ spectrum, one-dimensional (1D) NMR spatial distribution of signal and two-dimensional (2D) NMR images. It was demonstrated that CO₂ injection processes were applicable in target tight conglomerate reservoir with recovery factors of about 35%. The results of this study pore-scale revealed the feasibility of CO₂-assisted EOR technologies in tight conglomerate reservoirs.

CO ₂辅助的EOR技术似乎是低成本和生态友好的手段，可以提高致密油藏的原油产量。在致密的砂岩油藏中已广泛研究了CO ₂吞吐-正吹法和CO ₂驱油法的潜力，而在致密的砾岩油藏中却表现出微非均质性，而开展的工作很少。在目前的工作中，我们定量研究了在储层条件（地层压力23 MPa，温度69°C）下致密砾岩储层中CO ₂注入过程的潜力。使用高温高压核磁共振在线监测系统通过核磁共振现场监测油饱和度的变化T ₂光谱，信号的一维（1D）NMR空间分布和二维（2D）NMR图像。结果表明，CO ₂注入工艺适用于目标致密砾岩储层，采收率约为35％。这项研究的结果表明，在致密的砾岩油藏中，CO ₂辅助EOR技术的可行性。