石油学报 ›› 2018, Vol. 39 ›› Issue (3): 278-289.DOI: 10.7623/syxb201803003

• 地质勘探 • 上一篇    下一篇

东营凹陷沙河街组页岩油储集层润湿性、孔隙连通性和流体—示踪剂运移

胡钦红1,2, 刘惠民3, 黎茂稳4, 李政3, 杨锐2,5, 张宇翔2, 孙梦迪2,5   

  1. 1. 中国石油大学地球科学与技术学院 山东青岛 266580;
    2. 德克萨斯大学阿灵顿分校 美国德克萨斯州阿灵顿 76019;
    3. 中国石油化工股份有限公司胜利油田分公司勘探开发研究院 山东东营 257015;
    4. 页岩油气富集机理与有效开发国家重点实验室 中国石油化工股份有限公司石油勘探开发研究院 北京 100083;
    5. 中国地质大学构造与油气资源教育部重点实验室 湖北武汉 430074
  • 收稿日期:2017-03-16 修回日期:2017-11-10 出版日期:2018-03-25 发布日期:2018-04-10
  • 通讯作者: 胡钦红,男,1965年7月生,1986年获浙江农业大学学士学位,1995年获得美国亚里桑那大学博士学位,现为中国石油大学(华东)特聘教授、博士生导师,主要从事裂隙、基岩相互作用、页岩油气的赋存和运移行为研究。Email:water19049@gmail.com
  • 作者简介:胡钦红,男,1965年7月生,1986年获浙江农业大学学士学位,1995年获得美国亚里桑那大学博士学位,现为中国石油大学(华东)特聘教授、博士生导师,主要从事裂隙、基岩相互作用、页岩油气的赋存和运移行为研究。Email:water19049@gmail.com
  • 基金资助:

    国家重点基础研究发展计划(973)项目"中国东部古近系陆相页岩油富集机理与分布规律"(2014CB239100)和国家重大科技专项"中国典型盆地陆相页岩油勘探开发选区与目标评价"(2017ZX05049)资助。

Wettability, pore connectivity and fluid-tracer migration in shale oil reservoirs of Paleogene Shahejie Formation in Dongying sag of Bohai Bay Basin, East China

Hu Qinhong1,2, Liu Huimin3, Li Maowen4, Li Zheng3, Yang Rui2,5, Zhang Yuxiang2, Sun Mengdi2,5   

  1. 1. School of Geosciences, China University of Petroleum, Shandong Qingdao 266580, China;
    2. The University of Texas at Arlington, Texas Arlington 76019, USA;
    3. Exploration and Production Research Institute, Sinopec Shengli Oilfield Company, Shandong Dongying 257015, China;
    4. State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development;Sinopec Petroleum Exploration and Production Research Institute, Beijing 100083, China;
    5. Key Laboratory of Tectonics and Petroleum Resources of the Ministry of Education, China University of Geosciences, Hubei Wuhan 430074, China
  • Received:2017-03-16 Revised:2017-11-10 Online:2018-03-25 Published:2018-04-10

摘要:

对渤海湾盆地济阳坳陷东营凹陷沙河街组典型(块状、纹层状和层状)灰质泥页岩的润湿性、孔隙连通性和流体—示踪剂运移行为进行了系统研究。由于页岩油储层具有很强的亲油性和相对较弱的亲水性,而微—纳米级孔隙体系又与其独特的混杂型润湿性密切相关,因此开发了含不同分子大小和反应性能的极性与非极性示踪剂,并应用于毛细管自吸(蒸馏水与含示踪剂的正葵烷)和饱和扩散(含示踪剂的卤水)实验中,实验后的样品用激光剥蚀-电感耦合等离子体-质谱仪法,检测示踪剂在混杂型润湿性页岩中的分布行为和运移速率。研究结果表明,页岩在三维空间下呈现出特有的"双通道"运移行为:1由于其相对较弱的亲水性,孔喉直径大于10 nm亲水孔隙体系的传输性非常有限,不吸附示踪剂的有效扩散系数仅为(1~10)×10-13m2/s,其几何孔道迂曲度高达9.24±3.20;2孔喉直径约为5 nm的亲油孔隙体系有快速的传输特性,但流体运移行为明显受不同分子大小的阻塞作用影响。

关键词: 页岩油, 润湿性, 连通性, 示踪剂, 扩散, 自吸, 流体运移

Abstract:

A systematical research is conducted on the wettability, pore connectivity and fluid-tracer mingration of typical (massive, laminated and bedded) calcareous shale samples of Shahejie Formation in Dongying depression, Jiyang sag, Bohai Bay Basin. Shale oil reservoirs have strong oil-wetting and weak water-wetting characteristics, and the μm-nm pore systems are closely related to unique mixed wettability. For these reasons, both polar and non-polar tracers are developed with different molecular sizes and reactivities, and applied in the experiments of capillary imbibition (distilled water and the anemone containing tracer) and diffusion (the brine containing tracer). After experiments, the samples are treated using laser ablation-inductively coupled plasma-mass spectrometry, so as to detect the distribution behavious and migration rates of tracers in mixed wettability shale. The research results show that a unique "dual-pathway" migration characteristics are present to shale in 3D space. First, due to weak water-wetting characteristics, the transportability of hydrophilic pore system with pore-throat diameter greater than 10 nm is very limited, and nonabsorbing tracers have a low effective diffusion coeffieicnt of 10-13-10-12m2/s and a high geometrical tortuosity of 9.24±3.20. Sencondly, the hydrophobic pore system with the pore-throat diameter of about 5 nm is characterized by rapid transportation, but the fluid migration is significantly influenced by blocking effect of the molecules with different sizes.

Key words: shale oil, wettability, connectivity, tracers, diffusion, imbibition, tracer migration

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