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首页> 外文期刊>Australian Journal of Earth Sciences >Application of low-pressure gas adsorption to nanopore structure characterisation of organic-rich lower Cambrian shale in the Upper Yangtze Platform, South China
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Application of low-pressure gas adsorption to nanopore structure characterisation of organic-rich lower Cambrian shale in the Upper Yangtze Platform, South China

机译：低压气体吸附在南方扬子平台中有机丰富的下寒武纪页岩纳米孔结构特征

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摘要

The pores in shales are mainly on a nanometer scale, and the pore-size distribution is vital with regard to the preservation and exploitation of shale gas. This study focuses on the organic-rich lower Cambrian black shale in the Upper Yangtze Platform, South China and investigates their TOC, mineralogical composition and nanopore structure. Low-pressure N-2 and CO2 adsorption experiments were conducted at 77.35K and 273.15K, respectively, and the nanopore structures were characterised by the modified Brunauer-Emmett-Teller, Dubinin-Radushkevich, t-plot, Barrett-Joyner-Halenda and density functional theory (DFT) methods. The results indicate the following. (1) The lower Cambrian shale has a high TOC content (1.77-7.23 wt%) and a high quartz content (27.7-51.6 vol%). The total specific surface area varies from 12.02 to 28.87 m(2)/g. Both the total specific surface area and quartz content are positively associated with the TOC content. (2) Shale samples with a higher TOC content have a greater number of micropores, resulting in more complicated nanopore structures. Micropore volumes/surface areas and non-micropore surface areas all increase with increasing TOC content, indicating that TOC is the key factor determining the nanopore structure of the lower Cambrian shale. (3) A combination of N-2 and CO2 adsorption provides the most suitable detection range (approximate to 0.3-60 nm) and is both highly reliable and accurate with regard to nanopore structure characterisation.
机译：Shales的毛孔主要在纳米级上，孔径分布对于页岩气的保存和开发至关重要。本研究重点介绍，在南方南方平台上富有的有机富寒武纪黑色页岩，并调查其TOC，矿物学组成和纳米孔结构。低压N-2和CO 2吸附实验分别在77.35K和273.15K进行，纳米孔结构的特征是由改良的Brunauer-Emmett-Talker，Dubinin-Radushkevich，T-Plot，Barrett-Joyner-Halenda和密度函数理论（DFT）方法。结果表明以下。 （1）下寒武纪页岩具有高TOC含量（1.77-7.23wt％）和高石英含量（27.7-51.6 vol％）。总比表面积从12.02到28.87m（2）/ g不同。总特定表面积和石英含量均与TOC内容正相关。 （2）具有较高TOC含量的页岩样品具有更多的微孔，导致纳米孔结构更复杂。微孔体积/表面区域和非微孔表面区域随着TOC含量的增加而增加，表明TOC是确定下寒册页岩的纳米孔结构的关键因素。 （3）N-2和CO 2吸附的组合提供最合适的检测范围（近似为0.3-60nm），并且关于纳米孔结构表征的高度可靠和准确。

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