Geochemical Characteristics of Carbon and Hydrogen Isotopes for the Xujiahe Formation Natural Gas in Sichuan Basin

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  • 1.Research Institute of Petroleum Exploration and Development,PetroChina,Beijing 100083,China;
    2.Key Laboratory of Petroleum Geochemistry,China National Petroleum Corporation,Beijing 100083

Received date: 2013-09-16

  Revised date: 2013-12-30

  Online published: 2014-01-10

Abstract

The natural gases in Upper Triassic Xujiahe Formation in the Sichuan Basin are characterized by the tendency of “high in the west and north;low in the east and south” in dry coefficients,methane and ethane carbon isotopes,and methane hydrogen isotopes.The dry coefficients and the methane carbon isotopes increased with the burial depth,and it is similar to the thermal evolution of source rocks of Members 1,3,and 5 of Upper Triassic Xujiahe Formation.It is revealed that the natural gases in Xujiahe Formation were accumulated near the source rocks.Natural gases shown as partial reversal of carbon isotope series of alkane gases in the western Sichuan Basin may be due to mixing of gases from different from high to very high mature coal and dark mudstone at different periods.Results show that the hydrogen isotope values become heavier with the changes of depositional environment from terrestrial to marine,as well as with thermal maturity increase of natural gas.The hydrogen isotope values more than -160‰ for methane indicate that the source rock would be deposited in the marine environment,vice versa,it is terrestrial environment.
 

Cite this article

YU Cong,GONG De-yu,HUANG Shi-peng,WU Wei,LIAO Feng-rong,LIU Dan . Geochemical Characteristics of Carbon and Hydrogen Isotopes for the Xujiahe Formation Natural Gas in Sichuan Basin[J]. Natural Gas Geoscience, 2014 , 25(1) : 87 -97 . DOI: 10.11764/j.issn.1672-1926.2014.01.87

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