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天然气地球科学

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四川盆地龙岗气田长兴组—飞仙关组天然气地球化学特征及成因

邓焱，胡国艺，赵长毅   

  1. 中国石油勘探开发研究院，北京 100083
  • 收稿日期:2018-02-08 修回日期:2018-03-24 出版日期:2018-06-10 发布日期:2018-06-10
  • 通讯作者: 胡国艺(1968-)，男，安徽桐城人，高级工程师，博士，主要从事天然气地质研究. E-mail:huguoyi69@petrochina.com.cn
  • 作者简介:邓焱(1993-)，男，湖南邵阳人，硕士研究生，主要从事油气成藏研究.E-mail：371256523@qq.com.
  • 基金资助:

    国家科技重大专项课题“高过成熟天然气生成机理与源灶有效性评价”(编号：2016ZX05007-001)资助.

Geochemical characteristics and origin of natural gas in Changxing-Feixianguan Formations from Longgang Gasfield in the Sichuan Basin,China

Deng Yan，Hu Guo-yi，Zhao Chang-yi
 
  

  1. Research Institute of Petroleum Exploration and Development,Beijing 100083,China
  • Received:2018-02-08 Revised:2018-03-24 Online:2018-06-10 Published:2018-06-10

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摘要： 四川盆地龙岗气田长兴组—飞仙关组天然气主要为烃类气体，干燥系数非常高，非烃气体以CO2为主，H2S及N2含量较低，甲烷碳、氢同位素组成偏重，个别样品出现碳同位素倒转(δ13C1＞δ13C2)现象，并且天然气轻烃主体具有高甲基环己烷、低正构烷烃、低芳香烃的特点。气藏经历了较弱的TSR反应，对天然气组分及烷烃碳同位素影响较小，CO2气体主要来源于酸性流体与碳酸盐岩储层的反应。综合天然气碳、氢同位素及轻烃特征，分析认为天然气以高—过成熟煤成气为主，并存在少量油型气混入。天然气乙烷—储层沥青—烃源岩干酪根碳同位素综合对比表明，龙岗气田天然气主体煤成气来自下二叠统龙潭组煤系气源岩，其中混有少量来自上二叠统泥质烃源岩的原油裂解气。

关键词: 龙岗气田, 长兴组—飞仙关组, 天然气地球化学特征, 轻烃, 气源对比

Abstract: The natural gases reservoired in the Changxing and Feixianguan Formations of Longgang Gasfield in the Sichuan Basin are mainly composed of alkane gases which are dominated by methane with an extremely high dryness coefficient,and the non-hydrocarbon gases mainly consist of CO2 gas,with a relative low content of H2S and N2 gases.The values of carbon and hydrogen isotopes in methane are relatively high,only a few samples display positive carbon isotopic series (δ13C1＞δ13C2).And the C6-C7 light hydrocarbon components in natural gases are generally rich in methyl cyclohexane but poor in n-alkane and arenes.The gases have been altered by thermochemical sulfate reduction slightly,which has less influence on the alteration of natural gases components and carbon isotopes of alkane,and most of the CO2 are inorganic and were derived from the interaction between acidic fluid and carbonate reservoirs.Based on the characteristics of stable carbon and hydrogen isotope compositions and light hydrocarbons of the natural gases,the analysis of the study shows the natural gases are mainly composed of coal-related gases of high to over maturity,mixed with a small amount of oil-type gases.The comprehensive correlation of carbon isotope value distribution in ethane,bitumen and source rock kerogens have determined that the most part of the natural gases of Longgang Gasfield are coal-derived gas,which are generated by the coal measure strata in the Permian Longtan Formation,and the rest of the gases are oil cracked gases derived from the sapropelic-prone source rocks in the Upper Permian.

Key words: Longgang Gasfield, Changxing-Feixianguan Formations, Geochemical characteristics, Light hydrocarbon, Gas-source correlation

中图分类号: 

  • TE122.1+13


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