A Combination of N2 and CO2 Adsorption to Characterize Nanopore Structure of Organic-Rich Lower Silurian Shale in the Upper Yangtze Platform,South China:Implications for Shale Gas Sorption Capacity

被引:0
|
作者
CHEN Lei [1 ,2 ,3 ]
JIANG Zhenxue [1 ,2 ]
LIU Keyu [4 ,5 ]
GAO Fenglin [1 ,2 ]
WANG Pengfei [1 ,2 ]
机构
[1] State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum
[2] Unconventional Natural Gas Institute,China University of Petroleum
[3] Unconventional Oil & Gas Cooperative Innovation Center,China University of Petroleum
[4] CSIRO Earth Science and Resource Engineering
[5] School of Geosciences,China University of Petroleum
基金
中国国家自然科学基金;
关键词
shale gas; nanopore structure; Lower Silurian shale; Upper Yangtze Platform; sorption capacity;
D O I
暂无
中图分类号
P618.13 [石油、天然气];
学科分类号
0709 ; 081803 ;
摘要
The pores in shales are mainly of nanometer-scale,and their pore size distribution is very important for the preservation and exploitation of shale gas.This study focused on the organic-rich Lower Silurian black shale from four wells in the Upper Yangtze Platform,and their TOC,mineralogical composition and pore characterization were investigated.Low pressure N2and CO2adsorption were conducted at 77.35 K and 273.15 K,respectively,and the pore structures were characterized by modified Brunauer-Emmett-Teller(BET),Dubinin-Radushkevich(DR),t-plot,BarrettJoyner-Halenda(BJH) and density functional theory(DFT) methods and then the relationship between pore structure and shale gas sorption capacity was discussed.The results indicate that(1) The Lower Silurian shale has high TOC content of 0.92%-4.96%,high quartz content of 30.6%-69.5%,and high clays content of 24.1%-51.2%.The total specific surface area varies from 7.56 m2/g to 25.86 m2/g.Both the total specific surface area and quartz content are positively associated with the TOC content.(2)Shale samples with higher TOC content have more micropores,which results in more complex nanopore structure.Micropore volumes/surface areas and non-micropore surface areas all increase with the increasing TOC content.(3) A combination of N2and CO2adsorption provides the most suitable detection range(0.3-60 nm) and has high reliability and accuracy for nanopore structure characterization.(4) The TOC content is the key factor to control the gas sorption capacity of the Lower Silurian shale in the Upper Yangtze Platform.
引用
收藏
页码:1380 / 1394
页数:15
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