| 鄂尔多斯盆地陇东地区长7段页岩油储层自发渗吸特征及影响因素 |
| |
| 引用本文： | 周小航,陈冬霞,夏宇轩,曾溅辉,乔俊程,徐轩,蔡建超.鄂尔多斯盆地陇东地区长7段页岩油储层自发渗吸特征及影响因素[J].地球科学,2022,47(8):3045-3055. |
| |
| 作者姓名： | 周小航 陈冬霞 夏宇轩 曾溅辉 乔俊程 徐轩 蔡建超 |
| |
| 作者单位： | 1.中国石油大学油气资源与探测国家重点实验室, 北京 102249 |
| |
| 基金项目： | 国家自然科学基金42172159中石油战略合作科技专项项目ZLZX2020?02?01?03 |
| |
| 摘 要： | 自发渗吸存在于页岩油藏体积压裂和注水开发等多个关键阶段，是影响页岩油产能的重要因素之一，厘清渗吸特征及影响因素对提高页岩油采收率有重要意义. 对鄂尔多斯盆地长7段不同源储配置关系的页岩油储层岩心开展自发渗吸实验，结合核磁共振技术监测流体运移过程，分析储层物性及孔隙结构对页岩油储层自发渗吸的影响机制，明确源储配置关系对渗吸的控制作用. 长7段页岩油储层中储夹源型渗吸体积分数均值为33.84%，源储互层型为25.98%；储夹源型渗吸阶段斜率均值为0.359，源储互层型均值为0.302；渗吸过程中核磁共振横向弛豫时间小于10 ms的孔隙占比高；渗吸体积分数与润湿性、储层品质因子及孔喉比相关性较好. 长7段页岩油储层储夹源型配置关系渗吸能力优于源储互层型；储层渗吸能力主要由润湿性、储层品质因子及孔喉比控制.
|
| 关 键 词： | 自发渗吸 页岩油 源储配置关系 孔隙结构 核磁共振 储层物性 石油地质 |
| 收稿时间： | 2022-03-28 |
Spontaneous Imbibition Characteristics and Influencing Factors of Chang 7 Shale Oil Reservoirs in Longdong Area,Ordos Basin |
| |
| Abstract: | Spontaneous imbibition exists in many key stages such as volume fracturing and water injection development in shale reservoirs, which is one of the important factors affecting shale oil productivity. Clarifying the characteristics of imbibition and influencing factors is of great significance to improve the recovery of shale oil. In this paper, spontaneous imbibition experiments were carried out on shale oil reservoirs samples with different source?reservoir configuration relationships in Chang 7 member of Ordos Basin. Combined with NMR technology, fluid migration process was monitored, and the influence mechanism of reservoir physical properties and pore structure on spontaneous imbibition of shale oil reservoirs was analyzed, so as to clarify the control effect of source?reservoir configuration relationship on imbibition. The average volume fraction of source-type imbibition in Chang 7 member is 33.84 %, and the source-reservoir interbed type is 25.98 %. The average slope of the source?type suction stage is 0.359, and the average of the source?reservoir interlayer type is 0.302. The proportion of pores with NMR transverse relaxation time less than 10 ms in the imbibition process is high; imbibition volume fraction has good correlation with wettability, reservoir quality factor and pore throat ratio. The permeability of source?source configuration relationship of Chang 7 shale oil reservoir is better than that of source?reservoir interbed; reservoir imbibition capacity is mainly controlled by wettability, reservoir quality factor and pore throat ratio. |
| |
| Keywords: | |
|
| 点击此处可从《地球科学》浏览原始摘要信息 |
|
点击此处可从《地球科学》下载全文 |
|
