Molecular simulation of shale gas adsorption in organic-matter nanopores

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  • 1.State Key Lab of  Oil & Gas Reservoir Geology and Exploitation Engineering,Southwest Petroleum University,Chengdu 610500,China;
    2.School of Resources and Environment,Southwest Petroleum University,Chengdu  610500,China;
    3.Institute of Exploration and Development,Qinghai Oilfield Company,CNPC,Dunhuang 736202,China

Received date: 2016-06-15

  Revised date: 2016-07-30

  Online published: 2017-01-10

Abstract

Shale gas is a kind of unconventional oil-gas resource with tremendous potential.For thorough understanding of the methane adsorption and micromechanism in organic-matter nanopores of the shale and better acquaintances of the occurrence form,graphite slit-pores were set up as a representation of organic-matter nanopores by using Material Studio,and the grand canonical Monte Carlo method,molecular mechanics and molecular dynamics were used for the simulation of adsorption and diffusion behaviors in organic-matter pores on CH4 and CO2 at the shale gas common burial depth of 2-4km in the Upper Yangtze Plate.The results indicated that the adsorptions of CH4 and CO2 were physical and the optimal storage depth was 2km;The mixed adsorption data showed the rationality of exploit shale gas by injecting CO2to exchange CH4,and the optimal burial depth was 4km;The relative density of CH4 and CO2 along the normal direction of the pore inwall showed a trend of symmetric distribution and apparent adsorption stratifications appeared.As a whole,the self-diffusion coefficient of CH4 and CO2 increased with the increase of burial depth,and it's consistent with the reasons for such changes of adsorption amount and adsorption heat.

Cite this article

Zhang Ting-shan,He Ying-jie,Yang Yang,Wu Kun-yu . Molecular simulation of shale gas adsorption in organic-matter nanopores[J]. Natural Gas Geoscience, 2017 , 28(1) : 146 -155 . DOI: 10.11764/j.issn.1672-1926.2016.11.029

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