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To quantitatively assess the pore-scale mobilization capacity of shale oil reservoirs with strong heterogeneity, it is important to undertake fundamental research on the correlation between the pore size distribution and the oil production characteristics in typical lithofacies shale. In this study, a pressurized imbibition huff-n-puff experimental method was established to simulate the high-temperature and high-pressure conditions of the shale reservoir. This study focused on the laminated shale of three typical lithofacies from the Qingshankou Formation in the Gulong Sag of the Songliao Basin. High-pressure mercury intrusion (HPMI), low-pressure nitrogen adsorption (LPN2A), oil-water-shale contact angle measurement (CA), imbibition huff-n-puff (IHNP), and nuclear magnetic resonance (NMR) experiments were performed to analyze the pore size distribution and oil production characteristics in the microscopic pores of typical lithofacies shale. The study reveals that the oil recovery of imbibition huff-n-puff of the three types of shale cores exhibit a strong positive correlation with the sorting coefficient and permeability, while demonstrating a strong negative correlation with the nanoscale pore volume. In the sequence from laminated felsic shale to laminated mixed shale and then to clayey shale, the nanoscale pore volume increases, the sorting coefficient decreases, and the wettability shifts from neutral to oil-wetting, which is detrimental to the imbibition process. The laminated felsic shale achieves the highest oil recovery rate during both the first cycle and total two cycles of the imbibition huff-n-puff process. By increasing the pressure difference between the initial pore pressure and the injection pressure of imbibition media, the oil recovery rate of laminated mixed shale and clayey shale can be enhanced during the second cycle of imbibition huff-n-puff process. The research results have guiding implications for the imbibition development of continental shale oil and the optimization of enhanced oil recovery methods.

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Experimental Study on Pore Size Distribution and Oil Mobilization Characteristics in Continental Laminated Shale Oil Reservoirs

  • 会议论文

  • 发表日期：

    2026年

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  • Lan-Qing Fu,
  • Hong-An Chen,
  • Yong Liu,
  • Jia-Wei Li,
  • Tian-Yang Liu,
  • Huan-Qi Cui

摘要

To quantitatively assess the pore-scale mobilization capacity of shale oil reservoirs with strong heterogeneity, it is important to undertake fundamental research on the correlation between the pore size distribution and the oil production characteristics in typical lithofacies shale. In this study, a pressurized imbibition huff-n-puff experimental method was established to simulate the high-temperature and high-pressure conditions of the shale reservoir. This study focused on the laminated shale of three typical lithofacies from the Qingshankou Formation in the Gulong Sag of the Songliao Basin. High-pressure mercury intrusion (HPMI), low-pressure nitrogen adsorption (LPN2A), oil-water-shale contact angle measurement (CA), imbibition huff-n-puff (IHNP), and nuclear magnetic resonance (NMR) experiments were performed to analyze the pore size distribution and oil production characteristics in the microscopic pores of typical lithofacies shale. The study reveals that the oil recovery of imbibition huff-n-puff of the three types of shale cores exhibit a strong positive correlation with the sorting coefficient and permeability, while demonstrating a strong negative correlation with the nanoscale pore volume. In the sequence from laminated felsic shale to laminated mixed shale and then to clayey shale, the nanoscale pore volume increases, the sorting coefficient decreases, and the wettability shifts from neutral to oil-wetting, which is detrimental to the imbibition process. The laminated felsic shale achieves the highest oil recovery rate during both the first cycle and total two cycles of the imbibition huff-n-puff process. By increasing the pressure difference between the initial pore pressure and the injection pressure of imbibition media, the oil recovery rate of laminated mixed shale and clayey shale can be enhanced during the second cycle of imbibition huff-n-puff process. The research results have guiding implications for the imbibition development of continental shale oil and the optimization of enhanced oil recovery methods.