The effect of magnetite on the products and isotopic fractions of gaseous hydrocarbons

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  • 1.School of Earth and Space Sciences,Peking University,Beijing 100871,China;
    2.Research Institute of Petroleum Exploration and Development,CNPC,Beijing 100083,China;
    3.Key Laboratory of Petroleum Geochemistry,CNPC,Beijing 100083,China

Received date: 2016-09-05

  Revised date: 2016-11-01

  Online published: 2017-02-10

Abstract

In this paper,the influences of iron-bearing minerals on gas generation and isotopic fractionation of organic matters was studied by hydrous pyrolysis of a type-II kerogen of low maturity in the presence or absence of Fe3O4.Quantitative determination of the gas products generated during the experiments indicated that the addition of Fe3O4 would lower the yields of gaseous hydrocarbons,H2 and H2S,whereas exerting little influence on the yields of CO2.Carbon isotopic analysis revealed that when Fe3O4 is added to the reaction system,the carbon isotope of methane was not significantly affected,however,the isotopic values of both ethane and propone showed increase to different degrees.In contrast,the hydrogen isotopic values of the gaseous products in the presence of iron-bearing mineral were more depleted,and the reduction of methane and the ethane were 5‰-50‰ and 24‰-40‰,respectively.Likewise,the isotopic analysis of the residues showed similar trends with the gas products,which is the lighter hydrogen isotope values in the experiments with Fe3O4,and there are no obvious differences of carbon isotope with or without Fe3O4.Additionally,H/C elemental ratios of the residues decreased at a slower rate and exhibited higher values in the cases of iron-bearing mineral added experiments.The above results indicated that different reaction systems are of different reacting mechanisms.When Fe3O4 is absent,the reaction system operates in the cationic reacting mode.However,when Fe3O4 is added to the reaction system,cationic reactions were inhibited,thus resulting in the reduction of gas generation,and there exists indirect hydrogenation controlled by the presence of hydrogen.

Cite this article

Cai Yu-wen,Zhang Shui-chang,He Kun,Mi Jing-kui,Zhang Wen-long,Wang Xiao-mei,Wang Hua-jian,Wu Chao-dong . The effect of magnetite on the products and isotopic fractions of gaseous hydrocarbons[J]. Natural Gas Geoscience, 2017 , 28(2) : 331 -340 . DOI: 10.11764/j.issn.1672-1926.2016.12.014

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