基于扫描电镜-氮气吸脱附和压汞法的页岩孔隙结构研究

研究页岩孔隙结构特征，对于探讨页岩气赋存机理有重要意义。本文采用扫描电镜（SEM）、氮气吸脱附法与压汞法对鄂尔多斯盆地页岩样品的孔隙结构进行了全面表征，发现所研究区域页岩孔隙类型包括溶蚀孔隙、粒间孔隙和微裂缝；孔径从几个纳米到几百个微米，BET比表面积在7～25m^2／g之间，孔体积在0．01～0．03cm^3／g范围。研究结果表明鄂尔多斯盆地页岩具有良好的孔隙结构，孔隙类型丰富，孔径分布范围广泛，其中纳米级孔隙占主导，纳米级孔的存在有利于页岩气的存储，微裂隙的存在则有利于页岩气的运移。说明该区域页岩气的储藏具有良好的基础环境，页岩含气量可能较丰富。...

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Bibliographic Details
Published in岩矿测试 Vol. 34; no. 6; pp. 636 - 642
Main Author 陈生蓉 帅琴 高强 田亚 徐生瑞 黄云杰
Format Journal Article
LanguageChinese
Published 中国地质大学(武汉)材料与化学学院,湖北武汉,430074%中国地质调查局油气资源调查中心,北京,100029%中国地质大学(武汉)地球科学学院,湖北武汉,430074 2015
Subjects
低温氮气吸脱附
压汞法
孔隙结构
扫描电镜
页岩
低温氮气吸脱附
shale
mercury porosimetry
压汞法
页岩
low pressure nitrogen adsorption
Scanning Electron Microscope
扫描电镜
pore structure
孔隙结构
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ISSN0254-5357
DOI10.15898/j.cnki.11-2131/td.2015.06.006

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Summary:研究页岩孔隙结构特征，对于探讨页岩气赋存机理有重要意义。本文采用扫描电镜（SEM）、氮气吸脱附法与压汞法对鄂尔多斯盆地页岩样品的孔隙结构进行了全面表征，发现所研究区域页岩孔隙类型包括溶蚀孔隙、粒间孔隙和微裂缝；孔径从几个纳米到几百个微米，BET比表面积在7～25m^2／g之间，孔体积在0．01～0．03cm^3／g范围。研究结果表明鄂尔多斯盆地页岩具有良好的孔隙结构，孔隙类型丰富，孔径分布范围广泛，其中纳米级孔隙占主导，纳米级孔的存在有利于页岩气的存储，微裂隙的存在则有利于页岩气的运移。说明该区域页岩气的储藏具有良好的基础环境，页岩含气量可能较丰富。
Bibliography:Identification of porosity in shale is of great significance for exploring mechanism of shale gas. Porosity properties of the shale samples from the Ordos Basin were characterized by multiple techniques including Scanning Electron Microscope （SEM）, Mercury Intrusion Porosimetry （MIP）, and nitrogen gas adsorption-desorption. Results showed that the shales contained abundant pores that include dissolution pore, microfraeture pore, and intergranular pore. The pore sizes range from several to several hundred nanometers. The total surface area ranges from 5.06 to 19.32 m2/g and pore volume has a range of 0.01 -0.03 cm3/g. Results indicate that the OrdosBasin Shale develops pores of various types and sizes. The main type of pore is the nano-pore, which is beneficial for the storage of shale gas. Micro-cracks are beneficial for the transportation of shale gas. These results suggest that the basic environment of the Ordos Basin is suitable for the storage of shale gas and that the Ordos Basin may be rich in shale gas
ISSN:0254-5357
DOI:10.15898/j.cnki.11-2131/td.2015.06.006