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现代地质 ›› 2018, Vol. 32 ›› Issue (01): 191-197.DOI: 10.19657/j.geoscience.1000-8527.2018.01.19

• 油气勘探与开发 • 上一篇    下一篇

界面张力与润湿角校正对高压压汞法计算泥页岩孔径分布的影响——以松辽盆地青山口组为例

靳继阳1,2(), 薛海涛1(), 田善思1,2, 吴春正1,2, 李莹1,2, 周彬1,2, 赵日新1,2   

  1. 1.中国石油大学(华东) 非常规油气与新能源研究院,山东 青岛 266580
    2.中国石油大学(华东) 地球科学与技术学院,山东 青岛 266580
  • 收稿日期:2017-06-11 修回日期:2017-07-10 出版日期:2018-02-10 发布日期:2018-02-05
  • 通讯作者: 薛海涛,男,教授,博士,1975年出生,地球化学专业,主要从事油气地球化学方面的工作。Email:sea199101@sina.com
  • 作者简介:薛海涛,男,教授,博士,1975年出生,地球化学专业,主要从事油气地球化学方面的工作。Email:sea199101@sina.com
    靳继阳,男,硕士研究生,1989年出生,地质工程专业,主要从事石油地质与非常规油气勘探方面的工作。Email:13156886503@163.com
  • 基金资助:
    国家自然科学基金项目(41572122);国家重点基础研究发展计划(973计划)项目(2014CB239005);国家科技重大专项(2016ZX05004-001);国家科技重大专项(2016ZX05007-003)

Influence of Correction of Interfacial Tension and Wetting Angle to the Pore Size Distribution of Shale by Means of High Pressure Mercury Porosity:A Case Study of Qingshankou Formation in Songliao Basin

JIN Jiyang1,2(), XUE Haitao1(), TIAN Shansi1,2, WU Cunzheng1,2, LI Ying1,2, ZHOU Bin1,2, ZHAO Rixin1,2   

  1. 1. Research Institute of Unconventional Oil & Gas and Renewable Energy, China University of Petroleum, Qingdao, Shandong 266580,China
    2. School of Earth Science and Technology, China University of Petroleum,Qingdao, Shandong 266580,China
  • Received:2017-06-11 Revised:2017-07-10 Online:2018-02-10 Published:2018-02-05

摘要:

泥页岩储层孔隙结构研究对于页岩油气勘探、开发工作具有重要意义。高压压汞实验法是目前研究页岩孔隙结构、孔径分布广泛使用的方法。有学者对汞在石墨烯材料中润湿性研究发现,液态汞在孔隙中的界面张力γ和润湿角θ是孔半径r的函数,根据这一认识将Washburn方程中的界面张力γ和润湿角θ视为定值的传统数据处理方法表现出明显的不合理性,因此需要对Washburn方程进行参数校正。以松辽盆地青山口组页岩样品为例,进行高压压汞实验,利用校正前后的Washburn方程处理压汞数据,结果发现参数校正后得到的微孔(<2 nm)体积占比,比校正前微孔体积占比增加了118%,中孔(2~50 nm)体积占比减小了7%,大孔(>50 nm)体积占比基本不变,参数校正后得到的孔径分布能更加精确地表征页岩的孔径分布。

关键词: 泥页岩, Washburn方程, 孔径分布, 高压压汞, 界面张力, 润湿角

Abstract:

It is very important to study the pore structure of shale reservoirs for the exploration and development of shale oil and gas. The high pressure mercury intrusion method is widely used in the study of shale pore structure and pore size distribution. Some scholars have studied the wettability of mercury in graphene materials. It has been found that the interfacial tension γ and wetting angle θ of liquid mercury in the pores are a function of pore radius r. According to this understanding, the traditional data processing method, which regards the interfacial tension γ and wetting angle θ as determinants in the Washburn equation, shows obvious irrationality. So it is necessary to correct the parameters of Washburn equation. In this paper, the high-pressure mercury intrusion test was carried out in the Qingshankou Formation of the Songliao Basin. The data of the mercury intrusion corrected by the Washburn equation before and after the correction were analyzed. It was found that the volume fraction of the micropores (<2 nm) obtained after the calibration was increased by 118%, mesoporous (2 to 50 nm) volume proportion decreased by 7%, macroporous (>50 nm) volume ratio of the basic unchanged. The pore size distributions of the shales can be more accurately characterized by the pore size distributions obtained after the calibration.

Key words: shale, Washburn equation, pore size distribution, high pressure mercury intrusion, interfacial tension, wetting angle

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