天然气地球科学

• 天然气地质学 • 上一篇    下一篇

四川盆地志留系龙马溪组泥页岩吸水模拟实验及对孔隙连通性的指示意义

吕海刚,于萍,闫建萍,邵德勇,贾详娟,张同伟   

  1. 兰州大学地质科学与矿产资源学院,甘肃省西部矿产资源重点实验室,甘肃 兰州 730000
  • 收稿日期:2015-04-28 修回日期:2015-05-22 出版日期:2015-08-10 发布日期:2015-08-10
  • 通讯作者: 张同伟(1965-),男,甘肃武威人,教授,博士生导师,主要从事石油、天然气地质地球化学及成藏地球化学研究. E-mail:zhangtw@lzu.edu.cn.
  • 作者简介:吕海刚(1988-),男,河北石家庄人,硕士研究生,主要从事石油与天然气地质研究. E-mail:lvhg12@lzu.edu.cn.
  • 基金资助:

    国家重点基础研究发展规划(“973”)项目(编号:2012CB214701);中央高校基本科研业务费专项基金(编号:lzujbky-2013-114);国家自然科学基金(编号:41202095);教育部科学技术研究重大项目(编号:311010)联合资助.

Experimental Investigation of Water Absorption and Its Significance on Pore Network Connectivity in Mudstone from Silurian Longmaxi Formation,Sichuan Basin

LV Hai-gang,YU Ping,YAN Jian-ping,SHAO De-yong,JIA Xiang-juan,ZHANG Tong-wei   

  1. School of Earth Sciences & Key Laboratory of Western China′s Mineral Resources of Gansu Province,
    Lanzhou University,Lanzhou 730000,China
  • Received:2015-04-28 Revised:2015-05-22 Online:2015-08-10 Published:2015-08-10

摘要:

采用岩石小柱体吸水实验方法,结合N2吸附法对孔隙结构和BET比表面积的测量,以及TOC含量和黏土矿物含量的分析,研究了龙马溪组富有机质泥页岩对水的吸收程度,以此来探讨影响泥岩吸水的主控因素,以及对孔隙连通性的指示意义。结果表明:TOC和黏土矿物是影响泥页岩吸水的主控因素,泥岩吸水量与BET比表面积具较好的正相关性,吸水过程自发且可逆。相同泥页岩样品的绝对吸水量与其体积变化呈直线关系,斜率为单位体积吸水量,可计算泥岩有效孔隙度(6.23%),吸水研究为泥岩中孔隙的连通性和有效孔隙度的测量提供了新的手段。

关键词: 泥页岩, 孔隙特征, 连通性, 吸水模拟

Abstract:

The water uptake and main controlling factors on the organic-rich mudstone of Longmaxi Formation are investigated by water absorption experiment,N2 absorption and TOC and clay mineral contents.The results show that TOC and clay mineral contents are key factors that affect water absorption on mudstone.Water uptake in mudstone has a positive correlation with BET surface area,and the water uptaking in mudstone absorption is spontaneous and reversible.Based on the linear correlation between saturated water uptake of the same sample with different sample size and volume,the calculated effective porosity is 6.23%.Water absorption experiment provides a new method to measure the connected and effective porosity.

Key words: Mudstone, Pore structure, Connectivity, Water absorption

中图分类号: 

  • TE122.2

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