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天然气地球科学

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川南地区二叠系龙潭组页岩微观孔隙特征及其影响因素

张吉振，李贤庆，郭曼，董泽亮，王哲，付庆华，王飞宇   

  1. 1.中国矿业大学(北京)煤炭资源与安全开采国家重点实验室，北京100083； 
    2.中国矿业大学(北京)地球科学与测绘工程学院，北京100083；
    3.中国石油大学(北京)油气资源与探测国家重点实验室，北京102249；
    4.中国石油大学(北京)地球科学学院，北京102249
  • 收稿日期:2015-04-20 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: 李贤庆(1967-)，男，浙江富阳人，教授，博士生导师，主要从事煤油气地质、有机地球化学、有机岩石学等研究及教学工作. E-mail:Lixq@cumtb.edu.cn.
  • 作者简介:张吉振(1991-)，男，山东济宁人，硕士研究生，主要从事页岩气地质、地球化学研究. E-mail:ZJZcumtb@126.com.
  • 基金资助:

    国家重点基础研究计划(“973”)课题(编号:2012CB214702)；国土资源部公益性行业科研专项基金项目(编号:201311022)；教育部高等学校博士学科点基金项目(编号:20110023110017)联合资助.

Microscopic Pore Characteristics and Its Influence Factors of the Permian Longtan Formation Shales in the Southern Sichuan Basin

ZHANG Ji-zhen，LI Xian-qing，GUO Man，DONG Ze-liang，WANG Zhe，FU Qing-hua，WANG Fei-yu   

  1. 1.State Key Laboratory of Coal Resources and Safe Mining,China University of Mining and Technology(Beijing),
    Beijing 100083,China；2.College of Geosciences and Surveying Engineering,China University of Technology(Beijing),
    Beijing 100083,China; 3.State Key Laboratory of Petroleum Resource and Prospecting,China University of Petroleum
    (Beijing),Beijing 102249,China; 4.College of Geosciences,China University of Petroleum(Beijing),Beijing 102249,China
  • Received:2015-04-20 Revised:2015-05-22 Online:2015-08-10 Published:2015-08-10

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摘要：

为了评价海陆过渡相煤系页岩气储层性质，采用扫描电镜、高压压汞、低温液氮和CO2吸附等实验方法，对川南地区二叠系龙潭组页岩微观孔隙的发育情况、结构特征进行研究，并分析龙潭组页岩孔隙发育的主要影响因素。结果表明:川南地区龙潭组页岩储集空间多样，常见粒间孔、溶蚀孔和有机质孔，孔隙形态以圆形、椭圆形、三角形、不规则状为主，这些微观孔隙为页岩气赋存提供储集空间。龙潭组页岩纳米级孔隙以微孔和介孔为主，占孔隙总体积的56.2%，占总比表面积的80%以上，是页岩气赋存的主要载体；孔容与比表面积呈正相关性，其中介孔(BJH)孔容、微孔(DFT)孔容与比表面积线性关系拟合较好；页岩孔隙结构类型主要以平板狭缝型、柱形和混合型为主，孔径主要分布于0.2~1nm、3~30nm之间，平均为4.66nm。龙潭组页岩气储层孔隙发育受页岩的有机碳含量和成熟度影响较大，孔隙度和孔容随有机碳含量增大而增大，并与成熟度有密切关系；黏土矿物一定程度上利于储层孔隙发育，与页岩总孔容呈正相关性，脆性矿物则相反。

关键词: 页岩气储层, 龙潭组页岩, 微观孔隙, 孔隙结构, 气体吸附, 川南地区

Abstract:

In order to evaluate the marine-terrestrial shale gas reservoir in coal measures,the morphologic development characteristics and structure of microscopic pores in shale samples from the Permian Longtan Formation in the southern Sichuan Basin were studied,and their major influencing factors of shale pores are analyzed in this paper,by using scanning electron microscope(SEM),high-pressure mercury injection,low-temperature liquid nitrogen absoption and carbon dioxide absoption.The results show that there are many kinds of reservoir spaces,such as intergranular pores,dissolution pores and organic pores.The main pores are in circular,oval,triangular,and irregular shapes.These microscopic pores provide reservoir space for shale gas.The nano-scale pores in the Longtan Formation shale samples are dominated by micropores and mesopores.Both micropores and mesopores provide with 56.2% volume and over 80% specific surface area of total pores,and they are favorable for shale gas accumulation.There is a positive correlation between pore volume and specific surface area,and the relation between BJH volume,DFT volume and specific surface area is better.The pore structure is mainly with plate slit type,cylindricity,and mixed types.The pore aperture is mainly distributed in 0.4-1nm,3-30nm,and averaged at 4.66nm.All the organic carbon content,maturity(RO) of organic matter and clay minerals are certain favorable for the development of reservoir pores,while the content of brittle minerals has the opposite relation to it.

Key words: Shale gas reservoir, Longtan Formation shale, Microscopic pore, Pore structure, Gas adsorption, Southern Sichuan Basin

中图分类号: 

  • TE122.2
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