天然气地球科学

• 天然气地球化学 • 上一篇    下一篇

川中地区须家河组天然气地球化学特征

翟俪娜1,2,倪云燕3,吴朝东1,2,高金亮4   

  1. 1.北京大学造山带与地壳演化教育部重点实验室,地球与空间科学学院,北京 100871;
    2.北京大学石油与天然气研究中心,北京 100871;
    3.中国石油勘探开发研究院,北京 100083;
    4.中国科学院地质与地球物理研究所,北京 100029
  • 收稿日期:2016-10-29 修回日期:2017-02-28 出版日期:2017-04-10 发布日期:2017-04-10
  • 作者简介:翟俪娜(1989-),女,山东济宁人,博士研究生,主要从事沉积地球化学、石油地质学方面的研究. E-mail:zhailina@pku.edu.cn.
  • 基金资助:

    国家自然科学基金项目(编号:41472120)资助.

Geochemical characteristics of the natural gas from the Xujiahe Formation in the central Sichuan Basin,China

Zhai Li-na1,2,Ni Yun-yan3,Wu Chao-dong1,2,Gao Jin-liang4   

  1. 1.Key Laboratory of Orogenic Belts and Crustal Evolution,Ministry of Education,School of Earth and Space Sciences,Peking University,Beijing 100871,China;
    2.Institute of Oil and Gas,Peking University,Beijing 100871,China;
    3.PetroChina Research Institute of Petroleum Exploration and Development,Beijing 100083,China;
    4.Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China
  • Received:2016-10-29 Revised:2017-02-28 Online:2017-04-10 Published:2017-04-10

摘要:

为探明川中地区须家河组天然气特征、成因及来源,对该区须家河组天然气组分及碳、氢同位素特征进行了分析。结果表明:川中地区须家河组天然气以甲烷为主,除元坝、通南巴等地区外,主体表现为湿气特征,干燥系数小于0.95,天然气干燥系数主要受烃源岩成熟度的控制。δ13C1值介于-43.8‰~-29.3‰之间,δ13C2值介于-35.4‰~-24.3‰之间,δDCH4值介于-179‰~-152‰之间。天然气成因鉴别及气源对比结果表明:川中地区大部分气田须家河组天然气为煤成气,来源于须家河组煤系烃源岩。川中地区大部分区域仅少数天然气样品发生丙烷、丁烷的碳同位素部分倒转,主要由同源不同期气的混合所致。

关键词: 地球化学特征, 气源, 天然气, 须家河组, 川中地区

Abstract:

In order to investigate the characteristics,genesis and origin of the natural gas of the Xujiahe Formation in the central Sichuan Basin,we analyzed the geochemical compositions and carbon and hydrogen isotopes of gas samples from Guang’an Gasfield and made comparison with surrounding areas.The natural gas is mainly composed of methane.It is characterized by wet gas with a dryness coefficient generally lower than 0.95,except at Yuanba-Tongnanba area.The dryness coefficient is mainly controlled by the maturity of source rocks.The δ13C1 values range from -43.8‰ to -29.3‰,δ13C2 values range from -35.4‰ to -24.3‰,and δDCH4 values range from -179‰ to -152‰.The identification of gas origin and gas-source correlation indicate that the natural gas of the Xujiahe Formation in most gas fields is mainly derived from coal-measure source rocks in the Xujiahe Formation.At most areas,partial reversal of the carbon isotope series(δ13C313C4) is found in only a few gas samples,which is ascribed for the mixing of gas from the same source but different stages.

Key words: Geochemical characteristics, Gas source, Natural gas, Xujiahe Formation, Central Sichuan Basin

中图分类号: 

  • TE122.1+13

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