Study on hydrogen isotopes of hydrocarbon gases generated during hydrous pyrolysis of herbaceous marsh peat
Received date: 2017-12-17
Revised date: 2018-02-01
Online published: 2018-03-10
In order to understand the influence of diagenetic water medium on the isotopic compositions of thermogenic coalbed gas,hydrous and anhydrous pyrolysis experiments were performed on herbaceous marsh peat.We studied the hydrogen isotopic compositions,their differences and evolutionary law of hydrocarbon gases generated during the pyrolysis of the samples.It was found that the diagenetic water medium has a significant effect on the hydrogen isotopic composition of the hydrocarbon gases.Adding water with higher hydrogen isotopic value than peat-formed environmental water,the hydrocarbon isotope value of the hydrocarbon gas produced by peat pyrolysis was significantly higher.At pyrolysis intervals from peat to vitrinite reflectance values (RO) of 5.5%,the average δD values of pyrolytic methane,ethane and propane produced by hydrous peat pyrolysis experiment increased by 7‰,2‰ and 66‰,respectively.As the simulated temperature increased,the δD value of the generated hydrocarbon gas increased.It was considered that higher hydrogen isotope value of hydrocarbon gas produced by hydrous peat pyrolysis experiment resulted from the isotope exchange between water hydrogen and organic hydrogen.The relationships between RO values and the hydrogen isotopic compositions of the hydrocarbon gases generated by hydrous peat pyrolysis and the hydrogen isotopic relationship between the hydrocarbon gases were established.These results may provide a basis for studying on the genesis of coalbed gas formed by herbaceous marsh coal-forming material with the participation of diagenetic water media.
Duan Yi,Wu Ying-zhong,Zhao Yang,Cao Xi-xi,Ma Lan-hua . Study on hydrogen isotopes of hydrocarbon gases generated during hydrous pyrolysis of herbaceous marsh peat[J]. Natural Gas Geoscience, 2018 , 29(3) : 305 -310 . DOI: 10.1176/j.issn.1672-1926.2018.01.015
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