抄録
The shale oil reservoirs in the Jimusar area of the Junggar Basin exhibit a micro-nano scale pore-throat-fracture system, characterized by low porosity, low permeability, strong heterogeneity, and viscous oil, making development challenging. This study analyzed 80 shale core samples from the Lucaogou Formation using low-field nuclear magnetic resonance, mercury intrusion porosimetry, and CO₂ huff-and-puff experiments to explore the reservoir properties and oil-gas utilization patterns at different pore scales. The results revealed that small pores contribute minimally to oil and gas recovery, while medium (300-1000 nm) and large pores significantly enhance recovery efficiency. Temperature and pressure conditions (60-80°C, 10-15 MPa) also play a key role in improving oil mobility. Although the utilization potential in small pores is limited, CO₂ huff-and-puff technology effectively activates oil and gas recovery, especially in regions with well-developed medium and large pores. The study concludes that the synergy between reservoir pore structure and temperature-pressure conditions is crucial for improving recovery efficiency and provides valuable insights and optimized CO₂ huff-and-puff development strategies for efficient shale oil development in the Junggar Basin and similar reservoirs.
