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天然气地球科学

• 非常规天然气 • 上一篇    

低中煤阶构造煤的纳米级孔隙分形特征及瓦斯地质意义

李凤丽1,2，姜波1,2，宋昱1,2，汤政1,2   

  1. 1.中国矿业大学资源与地球科学学院，江苏 徐州 221116；
    2.中国矿业大学煤层气资源与成藏过程教育部重点实验室，江苏 徐州 221008
  • 收稿日期:2016-07-04 修回日期:2016-10-25 出版日期:2017-01-10 发布日期:2017-01-10
  • 通讯作者: 姜波(1957-)，男,安徽宿州人,教授，博士生导师，主要从事构造地质及煤与油气地质研究. E-mail：jiangbo@cumt.edu.cn.
  • 作者简介:李凤丽(1992-)，女，河南商丘人，硕士研究生，主要从事煤层气、页岩气等非常规天然气资源评价研究. E-mail：2294426325@qq.com.
  • 基金资助:

    国家自然科学基金重点项目“矿井瓦斯运移与富集的动力学过程及地球物理探测基础”(编号：41430317)资助.

Nano scale pore structure and fractal characteristicsof low-medium metamorphic tectonically deformed coal

Li Feng-li1,2，Jiang Bo1,2，Song Yu1,2，Tang Zheng1,2   

  1. 1.School of Resources and Earth Science,China University of Mining & Technology,Xuzhou 221116,China;
    2.Key Laboratory of Coalbed Methane Resource & Reservoir Formation Process,Ministry of Education,Xuzhou 221008,China
  • Received:2016-07-04 Revised:2016-10-25 Online:2017-01-10 Published:2017-01-10

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摘要：

利用低温液氮吸附实验，研究不同类型构造煤的孔隙结构和分形特征。研究表明：低中煤级构造煤的低温液氮吸附回线分为Ⅰ_Ⅲ类，Ⅰ类为碎裂煤孔隙，主要由一端开口及两端开口的圆筒形孔构成；Ⅱ类为片状煤和鳞片煤孔隙，主要由两端开口的圆筒形孔构成，含少量墨水瓶形孔和狭缝平板形孔；Ⅲ类为揉皱煤孔隙,主要由墨水瓶形孔和狭缝平板形孔构成。从原生结构煤到揉皱煤，大孔(>50nm)比表面积逐渐降低，介孔(2～50nm)比表面积变化不大，微孔(<2nm)比表面积逐渐增加，中值孔径逐渐减小；纳米孔孔隙结构分形维数逐渐增大，孔隙系统渐趋复杂，吸附能力增强。分形维数可以有效表征构造煤变形强度及其孔隙非均质性，分形维数较高(D>2.9)的揉皱煤，构造变形强，孔隙形态复杂，比表面积大；分形维数较低(2.6<D<2.9)的构造煤，如碎裂煤、片状煤等，构造变形相对较弱，孔隙形态单一。综合孔隙特征研究结果，对揉皱煤等构造煤发育区煤与瓦斯突出机制进行了探讨。

关键词: 低温液氮吸附, 孔隙结构, 分形特征, 瓦斯地质

Abstract:

The pore structure and fractal characteristic of different types of tectonically deformed coal(TDC),were investigated by the low-temperature nitrogen adsorption method.The adsorption loop curves of low rank TDCs were divided into three types,i.e,Ⅰ-Ⅲ.The pores in primary-and cataclastic coals mainly consist of cylinder pores with one or two sides open and that in schistose-and scaly coals are mainly constituted by cylinder pores with two sides open.There are also some slit type-and ink bottle type pores in schistose-and scaly coals.The pores in wrinkle coals mainly consist of ink bottle type-and slit type pores.From primary-to wrinkle coals,the specific surface area in macro-,meso-and micropores manifests as a significant decreasing,slight changing and gradual increasing with the enhancement of tectonic deformation respectively.With the increasing adsorption ability,the medium diameter of nano-pores gradually decreases whereas fractal dimension increases,indicating that pore system becomes more complicated.The coal body destructive intensities and the heterogeneity of pores can be effectively characterized by fractal dimension.Suffered from stronger tectonic deformation,the wrinkle coal with higher pore fractal dimensions(D>2.9) are characterized by more diversities in pore morphology,and larger amount specific surface area.The coals with low pore fractal dimensions(2.6<D<2.9) suffered relatively weak tectonic deformation,just as cataclastic coal and schistose coal.Based on the comprehensive characteristics of nano-pores obtained above,the mechanism of coal and gas outburst in tectonic deformed coal developed areas was discussed.

Key words: Low-temperature nitrogen adsorption, Pore structure, Fractal characteristic, Gas geology

中图分类号: 

  • TE132.3

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