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现代地质 ›› 2016, Vol. 30 ›› Issue (1): 172-180.

• 能源地质学 • 上一篇    下一篇

皖南地区古生界页岩孔隙特征及影响因素

张明扬1,2,李贤庆1,2,王哲1,2,董泽亮1,2,郭曼1,2,牛海岩1,2,郭俊枫2   

  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)
  • 出版日期:2016-01-29 发布日期:2016-05-01
  • 通讯作者: 李贤庆,男,教授,博士生导师,1967年出生,矿产普查与勘探专业,从事煤油气地质、有机地球化学和有机岩石学等方面的教学与科研工作。Email:lixq@cumtb.edu.cn。
  • 作者简介:张明扬,男,硕士研究生,1988年出生,地质工程专业,从事页岩气地质、地球化学方面的研究工作。 Email:389123155@qq.com。
  • 基金资助:

    国家重点基础研究发展计划项目(2012CB214702);国家自然科学基金项目(41572125);国土资源部公益性行业科研专项基金项目(201311022);教育部高等学校博士学科点专项科研基金项目(20110023110017)。

Pore Characteristics and the Controlling Factor of the Paleozoic Shale in the South Anhui

ZHANG Ming-yang1,2, LI Xian-qing1,2,WANG Zhe1,2, DONG Ze-liang1,2, GUO Man1,2, NIU Hai-yan1,2 ,GUO Jun-feng2   

  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)
  • Online:2016-01-29 Published:2016-05-01

摘要:

为了评估下扬子皖南地区古生界页岩气储层性质,应用扫描电子显微镜、高压压汞法、N2和CO2气体吸附法,对皖南地区古生界页岩孔隙特征和孔隙结构进行研究,并探讨页岩孔隙发育的主要影响因素。结果表明,皖南地区古生界页岩孔隙度和渗透率低,页岩样品中常见粒间孔、凝絮孔、溶蚀孔、基质晶间孔和有机质孔,并且发育微米-纳米级孔隙。古生界页岩孔隙中50%以上为微孔和介孔;孔隙结构主要为圆柱孔、狭缝型孔和混合型孔,平均孔径范围为4.17~12.06 nm。页岩孔容和比表面积随着有机碳(TOC)含量的增大而增大;页岩孔隙度随着有机质成熟度(Ro)的增大而减小;页岩孔容随着黏土矿物含量的增加而增大,随着脆性矿物含量的增加而减小。

关键词: 页岩气储层, 孔隙特征, 孔隙结构, 影响因素, 古生界页岩, 皖南地区

Abstract:

In order to assess the property of the Paleozoic shale gas reservoir in the south Anhui of Yangtze region, based on the scanning electron microscopy, high pressure mercury-injection, N2 and CO2 gas adsorption methods, the pore characteristics and structures of shale samples from the Paleozoic shales in the South Anhui were studied, and the controlling factors of pores development were discussed. The results show that the porosity and permeability of shale samples are low, and the microscopic pores mainly include inter-grain pores, floe pores, dissolution pores, matrix intergranular pores and organic pores, and the micro-nano scale pores are well developed in these shales. The main pore types in the Paleozoic shales are micropores and mesopores, which account for over 50%. The pore structure of shale is dominated by the parallel-plate pore, cylinder pore and mixed pore, and the average size is about 4.17-12.06 nm. The pore volume and specific surface area increase with the increasing of total organic carbon content (TOC). The porosity of shale reduces as the vitrinite reflectance (Ro) increases. The pore volume increases with the increasing of clay mineral content, but decreases with the increasing of brittle mineral content.

Key words: shale gas reservoir, pore characteristic, pore structure, controlling factor, Paleozoic shale, south Anhui

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