Stable Carbon Isotope Compositions of Gaseous Hydrocarbons in Pyrolysis Experiment and Geochemical Significance
Received date: 2009-10-23
Revised date: 2010-03-16
Online published: 2010-12-10
In this paper,different types of samples,including crude oil,chloroform bitumen A,oil fractions (saturated hydrocarbon,aromatic hydrocarbon and asphaltene),source rock and kerogen,were performed in pyrolysis experiment at high temperature.Carbon isotope composition of gaseous hydrocarbons was measured.With increase of pyrolysis temperatures,δ13C values of gaseous hydrocarbons from different types of samples (i.e crude oil,chloroform bitumen A,kerogen,source rock,and saturated hydrocarbon) were various,with heavy value of 13C at low temperature,lighter value at moderate temperature,and heavier value at higher pyrolysis temperature.A normal serial of stable carbon isotopes for methane,ethane and propane occurred before pyrolysis temperature less than 700℃.But,reverse trend happened at pyrolysis temperature more than 750℃.The different change of stable carbon isotope values and normal serial for gaseous hydrocarbons from aromatic hydrocarbon and asphaltene existed.Δδ13C2-1 values for gaseous hydrocarbon from all samples increased with pyrolysis temperature increasing.Values of Δδ13C3-1and Δδ13C3-2 were various for samples.A position correlation between δ13C2—δ13C3 and Ln（C2/C3）occurred with pyrolysis temperature increasing.
TANG Xiao-Qiang, HUANG Guang-Hui, ZHANG Min, CHEN Chao, HAN Jin-Ping, WU Di, ZHOU Xiao-Song . Stable Carbon Isotope Compositions of Gaseous Hydrocarbons in Pyrolysis Experiment and Geochemical Significance[J]. Natural Gas Geoscience, 2010 , 21(6) : 1029 -1035 . DOI: 10.11764/j.issn.1672-1926.2010.06.1029
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