Natural Gas Geoscience ›› 2012, Vol. 23 ›› Issue (3): 541-549.doi: 10.11764/j.issn.1672-1926.2012.03.541

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Geochemical Characteristics of Nitrogen and It′s Genesis inNatural Gas,Southern Margin of Junggar Basin

 SONG  Zhan-Dong, JIANG  Zhen-Xua, SONG  Yan, ZHAO  Meng-Jun, WEI  Yong   

  1. 1.State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum
    (Beijing),Beijing 102249,China; 2.Basin and Reservoir Research Center,China University of
    Petroleum(Beijing),Beijing 102249,China; 3.Research Institute of Petroleum Exploration and
    Development,Beijing 100083,China;    4.Key Laboratory  of  Basin Structure and Petroleum
    Accumulation,CNPC,Beijing 100083,China; 5.CNPC Greatwall Drilling Company,Beijing 100101,China
  • Received:2012-01-19 Revised:2012-04-01 Online:2012-06-10 Published:2012-06-10

Abstract:

According to statistics of 155 gas samples from the southern margin of Junggar basin,the N2 -enriched gas is mainly distributed in the neogene Shawan Formation,Palaeogene Ziniquanzi Formation and the shallow layers of the north Tianshan piedmont.Chemical and carbon isotopic compositions of the natural gas indicate both N2 and hydrocarbon gases in the natural gases are derived from the Jurassic coal in the southern margin of Junggar basin and not from atmosphere and mantle-volcanic gas.The N2  content in natural gas is relative to reservoir age and buried depth of gas reservoir,the content of N2  is increasing with reservoir age chances from old to young and buried depth from deep to shallow.The relatively high N2  content is controlled by vertical migration of gas.Natural gas is degraded by microbe in the neogene Shawan Formation,Palaeogene Ziniquanzi Formation and the shallow layers at the north Tianshan piedmont.

Key words: Chemical composition, N2 genesis, Gas migration, Southern margin of Junggar basin, Carbon isotopic composition.

CLC Number: 

  • TE122.1+13

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