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

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  • 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 date: 2016-01-20

  Revised date: 2016-03-01

  Online published: 2019-09-10

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.

Cite this article

Zhu Yang-sheng, Song Xue-hang, Guo Yin-tong, Xu Feng, Sun Nan-nan, Wei Wei . High-pressure adsorption characteristics and controlling factors of CH4 and CO2 on shales from Longmaxi Formation,Chongqing,Sichuan Basin[J]. Natural Gas Geoscience, 2016 , 27(10) : 1942 -1952 . DOI: 10.11764/j.issn.1672-1926.2016.10.1942

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