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天然气地球科学 ›› 2012, Vol. 23 ›› Issue (3): 541–549.doi: 10.11764/j.issn.1672-1926.2012.03.541

• 天然气地球化学 • 上一篇    下一篇

准噶尔盆地南缘天然气中N2地球化学特征及成因分析

 宋占东, 姜振学, 宋岩, 赵孟军, 魏勇   

  1. 1.中国石油大学(北京)油气资源与探测国家重点实验室,北京102249;
    2.中国石油大学(北京)盆地与油藏研究中心,北京102249;
    3.中国石油勘探开发研究院,北京100083;
    4.中国石油天然气集团公司盆地构造与油气成藏重点实验室,北京100083；
    5.长城钻探工程有限公司，北京 100101
  • 收稿日期:2012-01-19 修回日期:2012-04-01 出版日期:2012-06-10 发布日期:2012-06-10
  • 通讯作者: 宋占东songfy01@163.com. E-mail:songfy01@163.com.
  • 作者简介:宋占东(1971-),男,蒙古族,吉林白城人,博士后,主要从事油气成藏机理与分布规律研究. E-mail：songfy01@163.com.
  • 基金资助:

    国家自然科学基金项目(编号:40972088)；国家科技重大专项(编号:2011ZX05003-001)联合资助.

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

摘要：

通过统计分析准噶尔盆地南缘155个天然气样品组分和碳同位素数据，发现天然气中的N2主要富集在新近系沙湾组、古近系紫泥泉子组和北天山山前的浅部地层中。天然气组分和碳同位素表明，N2和烃类气体为同源生成，均来自有机质处于高—过成熟阶段的侏罗系煤系地层，没有大气渗入和岩浆—火山气体的混入。N2含量与储层年龄和地层埋深有关，随着地层由老到新，埋藏由深至浅，N2逐渐富集。高含氮天然气主要受运移作用控制，是天然气垂向运移的结果，新地层和北天山山前浅部地层中赋存的天然气受到微生物降解。

关键词: 天然气组分, N2成因, 天然气运移, 准噶尔盆地南缘, 天然气碳同位素

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.

中图分类号: 

  • TE122.1+13

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