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中南大学学报(自然科学版)

Journal of Central South University

第45卷    第12期    总第244期    2014年12月

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文章编号:1672-7207(2014)12-4370-07
致密油储层水驱油核磁共振实验研究
李海波1, 2, 3,郭和坤1, 3,刘强2, 3,孟智强2, 3,王学武1, 3,孙玉平1, 2, 3

(1. 中石油勘探开发研究院 廊坊分院,河北 廊坊,065007;
2. 中国科学院大学 物理学院,北京 100049;
3. 中国科学院 渗流流体力学研究所,河北 廊坊,065007
)

摘 要: 针对鄂尔多斯盆地有代表性致密油储层岩心,将核磁共振技术与水驱油物模实验相结合,对储层初始状态油相赋存特征及水驱油后微观剩余油分布特征进行研究。研究表明:水驱油前,渗透率>0.3×10-3 μm2储层粒间孔内(大、中等孔隙)油赋存量多于黏土微孔,渗透率<0.1×10-3 μm2储层大孔隙很少,油主要赋存于黏土微孔及中等孔隙内。水驱油后,4个渗透率级别(>1×10-3,0.3~1×10-3,0.1~0.3×10-3和小于0.1×10-3 μm2)储层大孔隙采出程度R均很高,分别为77.35%,73.75%,75.70%和60.66%,剩余油饱和度Sorm均很低,分别为3.10%,4.71%,0.81%和0.50%,大孔隙内很少或无剩余油;中等孔隙R较高,分别为64.32%,53.52%,73.34%和82.68%,Sorm较低,分别为10.30%,13.89%,7.95%和5.05%;渗透率越低,该类孔隙R越高,Sorm越低;黏土微孔R均很低,分别为14.32%,17.09%,19.79%和22.61%,Sorm均很高,分别为27.99%,20.94%,29.18%和31.15%,表明剩余油主要分布在黏土微孔内。不同区块层位比较,Ⅰ层好于Ⅱ层,AⅠ储层最好。

 

关键词: 致密油储层;鄂尔多斯盆地;水驱油;核磁共振;剩余油分布

NMR experimental study of water displacing oil of tight oil reservoir
LI Haibo1, 2, 3, GUO Hekun1, 3, LIU Qiang2, 3, MENG Zhiqiang2, 3, WANG Xuewu1, 3, SUN Yuping1, 2, 3

1. Petrochina Research Institute of Petroleum Exploration and Development-Langfang, Langfang 065007, China;
2. University of Chinese Academy of Sciences, Beijing 100049, China;
3. Institute of Flow and Fluid Mechanics, Chinese Academy of Sciences, Langfang 065007, China

Abstract:Representative tight oil reservoir cores of Erdos basin was studied combined NMR technology and core displacement test, and analysis microscopic oil distribution characteristics both initial state and after water flooding of reservoir. The results show that: Before water flooding, while permeability is greater than 0.3×10-3 μm2, oil exist in intergranular pores (large, medium pores) more than clay micropores, and while permeability is less than 0.1×10-3 μm2, few macropores exist in reservoir and oil mainly exist in clay micropores and medium pores. After water flooding, four permeability level(greater than 1×10-3, 0.3-1×10-3, 0.1-0.3×10-3 μm2 and less than 0.1×10-3 μm2) reservoir recovery percent of reserves R of large pores are very high (77.35%, 73.75%, 75.70% and 60.66%, respectively), remaining oil saturation Sorm are very low (3.10%, 4.71%, 0.81% and 0.50%, respectively),few or no remaining oil in macropores. R of medium pores are high (64.32%, 53.52%, 73.34% and 82.68%, respectively), Sorm are low (10.30%, 13.89%, 7.95% and 5.05%, respectively), the lower permeability reservoir have, the higher R and the lower Sorm reservoir get in this pores. R of clay micropore are very low (14.32%, 17.09%, 19.79% and 22.61%, respectively), Sorm are high (27.99%, 20.94%, 29.18% and 31.15%, respectively), show that remaining oil mainly distributes in clay micropores. Comparison of different blocks and layers, layer Ⅰ is better than Ⅱ, and AⅠ reservoir is best.

 

Key words: tight oil reservoir; Erdos basin; wate displace oil; nuclear magnetic resonance (NMR); remaining oil distribution

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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