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四川盆地龙马溪组页岩的CH4和CO2气体高压吸附特征及控制因素

朱阳升1,2，宋学行1，郭印同3，徐峰3，孙楠楠1，魏伟1,4   

  1. 1.中国科学院上海高等研究院，中国科学院低碳转化科学与工程重点实验室，上海 201203；
    2.上海大学环境与化学工程学院，上海 200444；
    3.中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室，湖北 武汉 430071；
    4.上海科技大学物质科学与技术学院，上海 201210
  • 收稿日期:2016-01-20 修回日期:2016-03-01 出版日期:2016-10-10 发布日期:2016-10-10
  • 通讯作者: 魏伟(1971-)，男，山东临沂人,研究员,博士生导师，主要从事C1化学与工程、二氧化碳捕获、利用和封存等研究. E-mail:weiwei@sari.ac.cn.
  • 作者简介:朱阳升(1989-)，男，安徽枞阳人，硕士研究生，主要从事页岩超临界二氧化碳压裂与储层吸附研究. E-mail:zhuys@sari.ac.cn.
  • 基金资助:
    中国科学院战略性先导科技专项(B类)_页岩储层无水压裂关键技术研究(编号：XDB10040200)资助.

High-pressure adsorption characteristics and controlling factors of CH4 and CO2 on shales from Longmaxi Formation,Chongqing,Sichuan Basin

Zhu Yang-sheng1,2，Song Xue-hang1，Guo Yin-tong3，Xu Feng3，Sun Nan-nan1，Wei Wei1,4   

  1. 1.CAS Key Laboratory of Low-Carbon Conversion Science and Engineering,Shanghai Advanced Research Institute,
    Chinese Academy of Sciences,Shanghai 201203,China;
    2.School of Environment and Chemical Engineering,Shanghai University,Shanghai 200444,China;
    3.State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan 430071,China;
    4.School of Physical Science and Technology,Shanghai Tech University,Shanghai 201210,China
  • Received:2016-01-20 Revised:2016-03-01 Online:2016-10-10 Published:2016-10-10

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摘要： 通过对四川盆地重庆地区下志留统龙马溪组的钻井岩心和野外露头等进行分析，利用高压吸附仪分析了页岩中CH4、CO2气体的吸附性能，并采用N2吸附法、CO2吸附法、场发射扫描电子显微镜(FE_SEM)和X-射线衍射(XRD)等技术，从孔隙结构、有机碳含量、矿物成分、温度和单位压力变化等方面探讨页岩吸附能力的影响关系。研究表明，龙马溪组页岩CH4、CO2吸附曲线具有Ⅰ型等温线特征，用Langmuir模型回归等温线能较好地拟合实验数据；页岩的总孔体积、比表面积与饱和吸附量体现良好的线性相关关系，且正相关；页岩有机质和矿物成分通过控制着微米_纳米级孔隙的相对丰度影响着气体的吸附和储存，微孔、中孔孔体积及孔隙度均随总有机碳含量(TOC)值增加而增大；TOC值越大，页岩的饱和吸附量就越大，二者具有良好的正相关性；吸附气量与黏土矿物含量呈正线性相关，与脆性矿物含量呈现相反的变化规律。温度升高会加快气体解吸速度，降低吸附量；此外，页岩对CO2吸附能力高于CH4。

关键词: 页岩, 孔隙结构, CO2吸附, CH4吸附, 吸附特征, 控制因素

Abstract: Adsorption isotherms for CH4 and CO2 under different temperatures were measured by high pressure adsorption analyzer on the Longmaxi Formation shale samples collected from Chongqing region in Sichuan Basin.Meanwhile,various characterization methods such as gas adsorption (N2,CO2) analysis,field emission scanning electron microscope (FE-SEM) and X-ray diffraction (XRD) were used to analyze the influence of porous structure,TOC,mineral composition,temperature and unit change in pressure on the absorption behavior.Type I isotherms were obtained for the adsorption of both CO2 and CH4 on the sample,and the experimental data can be fitted very well by the Langmuir model.The pore volumes and BET specific surface areas are positively related to the saturated adsorption capacity.TOC and clay mineral composition affect the gas adsorption through controlling of the porous structure (micron and nanometer scale).Micropore and mesopore were mostly originated from the organic matter and increased with the increase of TOC.The higher the TOC value and the clay mineral contents,the greater the adsorption capacity,while brittle minerals had a negative effect on adsorption capacity.Furthermore,CO2 and CH4 adsorption capacity decrease with temperature rising on account of gas desorption rate increasing.In addition,the sorption capacity of CO2 is always higher than CH4.

Key words: Shale, Pore structure, CO2 sorption, CH4 sorption, Sorption properties, Controlling factor

中图分类号: 

  • TE122.2

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