页岩油含油饱和度对渗吸采收率的影响规律研究

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

油气藏评价与开发 ›› 2025, Vol. 15 ›› Issue (1): 73-78.doi: 10.13809/j.cnki.cn32-1825/te.2025.01.009

页岩油含油饱和度对渗吸采收率的影响规律研究

周旭¹(), 马超¹^,²^,³(), 刘超¹, 唐嘉婧¹, 刘怡麟¹

1.长江大学石油工程学院，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
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

收稿日期:2024-07-19 发布日期:2025-01-26 出版日期:2025-02-26
通讯作者: 马超 E-mail:2022710342@yangtzeu.edu.cn;500526@yangtzeu.edu.cn
作者简介:周旭（2001—），男，在读硕士研究生，主要从事致密油渗吸特征及影响因素相关研究。地址：湖北省武汉市蔡甸区大学路111号，邮政编码：430100。E-mail：2022710342@yangtzeu.edu.cn
基金资助:
科技部外国专家局外国专家重点支撑计划项目“表面修饰纳米二氧化硅/温敏聚合物复合材料开发及在非常规油气增产液中的应用”(wgxz2022057)

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

ZHOU Xu¹(), MA Chao¹^,²^,³(), LIU Chao¹, TANG Jiajing¹, LIU Yilin¹

1. School of Petroleum Engineering, Yangtze University, Wuhan, Hubei 430100, China
2. Key Laboratory of Drilling and Production Engineering for Oil and Gas of Hubei Province, Yangtze University, Wuhan, Hubei 430100, China
3. National Engineering Research Center for Oil and Gas Drilling and Completion Technology, School of Petroleum Engineering, Yangtze University, Wuhan, Hubei 430100, China

Received:2024-07-19 Online:2025-01-26 Published:2025-02-26
Contact: MA Chao E-mail:2022710342@yangtzeu.edu.cn;500526@yangtzeu.edu.cn

摘要/Abstract

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。

关键词: 页岩油, 含油饱和度, 渗吸采收率, 渗吸速率, 核磁共振

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.

Key words: shale oil, oil saturation, imbibition recovery rate, imbibition rate, nuclear magnetic resonance

中图分类号:

TE122

周旭,马超,刘超,等. 页岩油含油饱和度对渗吸采收率的影响规律研究[J]. 油气藏评价与开发, 2025, 15(1): 73-78.

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.

图/表 8

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岩心编号	直径/mm	长度/mm	孔隙度/%	渗透率/（10^-3 μm²）
A-1	24.75	54.16	9.57	0.035
A-2	24.62	55.84	9.19	0.027
A-3	24.80	55.50	8.85	0.011
A-4	24.74	54.40	9.35	0.088
B-1	24.60	55.34	7.49	0.580
B-2	24.68	56.30	8.97	0.630
B-3	24.10	54.82	11.20	0.700
B-4	24.72	54.04	9.55	0.930
C-1	24.75	56.57	11.94	0.220

岩心编号	质量法		核磁面积法
岩心编号	渗吸量/mL	采收率/%	T₂谱信号峰面积差	采收率/%
A-1	0.06	11.86	133.32	10.60
A-2	0.11	14.96	214.69	12.73
A-3	0.20	20.74	361.83	18.35
A-4	0.29	22.92	713.09	19.24

页岩油含油饱和度对渗吸采收率的影响规律研究

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

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