延长油田坪北区长8储层孔隙结构特征及其对水驱油微观特征的影响

发布时间：2018-01-17 17:24

  本文关键词：延长油田坪北区长8储层孔隙结构特征及其对水驱油微观特征的影响　出处：《大庆石油地质与开发》2017年05期 　论文类型：期刊论文

  更多相关文章： 孔隙结构 驱油效率 储层物性 孔喉 坪北区 长

【摘要】：储层孔隙结构对水驱油特征有重大影响。以延长油田坪北区长8储层为例,综合利用岩心、铸体薄片、扫描电镜、压汞实验等资料对储层孔隙结构进行分析,通过真实砂岩微观模型实验,探讨了不同孔隙结构对水驱油效率的影响。研究表明:长8储层主要岩性为细粒长石砂岩和细粒岩屑长石砂岩,主要孔隙类型为残余粒间孔隙(原生孔隙)、溶蚀粒间和粒内孔隙(次生孔隙);储层类型可分为Ⅰ类、Ⅱ类、Ⅲ类和Ⅳ类,Ⅰ、Ⅱ类为主要储层;水驱油驱替类型以均匀驱替、网状均匀驱替、指状网状驱替以及指状驱替为主,储层物性、孔喉特征对驱油效率有重要影响,Ⅰ、Ⅱ类储层驱油效率高达50%。明确孔隙结构与驱油效率关系可更好地指导油气合理开发。
[Abstract]:The pore structure of reservoir has great influence on the characteristics of water flooding. Taking Chang 8 reservoir in Pingbei District of Yanchang Oilfield as an example, the pore structure of reservoir is analyzed by using the data of core, casting thin section, scanning electron microscope and mercury injection experiment. The effect of different pore structure on oil displacement efficiency is discussed through microscopic model experiments of real sandstone. The results show that the main lithology of Chang 8 reservoir is fine feldspathic sandstone and fine grain lithic feldspathic sandstone. The main pore types are residual intergranular pores (primary pores), dissolved intergranular and intragranular pores (secondary pores); The reservoir types can be divided into class 鈪，

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