Study on the influence of shale oil saturation on imbibition recovery rate

ZHOU Xu; MA Chao; LIU Chao; TANG Jiajing; LIU Yilin

doi:10.13809/j.cnki.cn32-1825/te.2025.01.009

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Study on the influence of shale oil saturation on imbibition recovery rate

更新时间：2025-12-05

- Study on the influence of shale oil saturation on imbibition recovery rate
- Petroleum Reservoir Evaluation and Development Vol. 15, Issue 1, Pages: 73-78(2025)
- 作者机构：
  
  1. 长江大学石油工程学院，湖北武汉 430100长江大学油气钻采工程湖北省重点实验室,湖北,武汉,430100
  2. 长江大学油气钻采工程湖北省重点实验室，湖北武汉 430100长江大学石油工程学院油气钻完井技术国家工程研究中心,湖北,武汉,430100
  3. 长江大学石油工程学院油气钻完井技术国家工程研究中心,湖北,武汉,430100
- 作者简介：
- 基金信息：
- DOI：10.13809/j.cnki.cn32-1825/te.2025.01.009
  CLC： TE122
- Published：2025
- 稿件说明：
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ZHOU Xu, MA Chao, LIU Chao, et al. Study on the influence of shale oil saturation on imbibition recovery rate[J]. Petroleum Reservoir Evaluation and Development, 2025, 15(1): 73-78.
DOI：

ZHOU Xu, MA Chao, LIU Chao, et al. Study on the influence of shale oil saturation on imbibition recovery rate[J]. Petroleum Reservoir Evaluation and Development, 2025, 15(1): 73-78. DOI： 10.13809/j.cnki.cn32-1825/te.2025.01.009.

摘要

为了明确不同含油饱和度页岩油对渗吸采收率的影响规律，以江汉盆地江陵凹陷的页岩样品为研究对象，采用渗吸实验研究了渗透率相近和逐渐增大条件下，含油饱和度分别为20%、30%、40%、50%时，岩心渗吸曲线的变化规律，并利用核磁共振技术分析了渗吸前后岩心孔隙内油相信号的变化，最后对渗吸过程中的渗吸量和换油量进行了对比。结果表明：渗透率相近时，含油饱和度越高的岩心渗吸采收率越高；相比较而言，含油饱和度较高的岩心在渗吸初期的渗吸速率较慢，达到渗吸平衡所用的时间也较长；渗透率逐渐增大时，含油饱和度越高的岩心渗吸采收率越高，但此时较高含油饱和度岩心在前期的渗吸速率大于较低含油饱和度岩心。由于页岩的水化膨胀作用导致其在渗吸过程中的渗吸量并不等于换油量，而是大于换油量，且含油饱和度越高，两者的差值越大。研究结论可以为提高页岩油采收率提供理论参考。

Abstract

To investigate the influence of shale oil with different oil saturation on imbibition recovery rate

shale samples from the Jiangling sag in the Jianghan Basin were taken as the research object. Imbibition experiments were conducted to examine the variation of core imbibition curves at oil saturation of 20%

30%

40%

and 50% under conditions of similar and increasing permeability. Nuclear magnetic resonance (NMR) technology was used to analyze the changes in oil-phase signals within the core pores before and after imbibition. Additionally

the imbibition volume and oil displacement volume during the imbibition process were compared. The results showed that under similar permeability conditions

cores with higher oil saturation exhibited higher imbibition recovery rates. In contrast

cores with higher oil saturation had slower imbibition rates at the initial stage of imbibition and required a longer time to reach imbibition equilibrium. When permeability gradually increased

cores with higher oil saturation achieved higher imbibition recovery rates. In this case

cores with higher oil saturation also exhibited faster imbibition rates in the early stages compared to those with lower oil saturation. The hydration and expansion of shale resulted in the imbibition volume exceeding the oil displacement volume during the imbibition process. Moreover

the difference between these two volumes increased with higher oil saturation. The findings of this study provide a theoretical basis for improving shale oil recovery.

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