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天然气地球科学

• 天然气地球化学 • 上一篇    

四川盆地上二叠统龙潭组烃源岩的地球化学特征及对有机质来源和沉积环境的指示意义

魏志福，王永莉，吴陈君，吴保祥，孙则鹏，李生喜，魏威   

  1. 1.甘肃省油气资源研究重点实验室/中国科学院油气资源研究重点实验室，甘肃 兰州 730000；
    2.甘肃省地矿局第二地勘院，甘肃 兰州 730020
  • 收稿日期:2015-04-28 修回日期:2015-06-03 出版日期:2015-08-10 发布日期:2015-08-10
  • 通讯作者: 王永莉(1969-)，女，甘肃兰州人，研究员，博士生导师，主要从事有机地球化学和环境科学研究. E-mail:wyll6800@lzb.ac.cn.
  • 作者简介:魏志福（1985-），男，甘肃会宁人，助理研究员，博士，主要从事油气/有机地球化学研究. E-mail:williamwei2011@hotmail.com.
  • 基金资助:

    国家重点基础研究发展计划（"973”）项目(编号：2012CB214701)；中国科学院战略性先导科技专项(编号：XDB10030404)；中国科学院“西部之光”人才培养计划项目和中国科学院“西部之光”联合学者项目联合资助.

Geochemical Characteristics of Source Rock from Upper Permian Longtan Formation in Sichuan Basin

WEI Zhi-fu，WANG Yong-li，WU Chen-jun，WU Bao-xiang，SUN Ze-peng，LI Sheng-xi，WEI Wei   

  1. 1.Key Laboratory of Petroleum Resources，Gansu Province/Key Laboratory of Petroleum Resources Research,
    Institute of Geology and Geophysics,Chinese Academy of Sciences,Lanzhou 730000,China;
    2.The 2nd Institute of Geology and Mineral Exploration,Lanzhou 730020,China
  • Received:2015-04-28 Revised:2015-06-03 Online:2015-08-10 Published:2015-08-10

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793

摘要：

通过对四川盆地上二叠统龙潭组烃源岩典型剖面样品的地球化学分析，从TOC含量、TOS含量、生物标志化合物特征等方面讨论四川盆地上二叠统龙潭组烃源岩地球化学特征及意义。 实验数据显示:四川盆地上二叠统龙潭组烃源岩TOC含量、TOS含量在剖面上变化幅度较大，表现出明显的非均质性；上二叠统龙潭组煤和炭质泥岩中正构烷烃主要呈现单峰型，高碳数正构烷烃相对丰度较高，姥鲛烷优势明显；而页岩样品以双峰型为主，低碳数峰群主碳集中在nC17，而高碳数峰群以nC25或nC27为主碳峰，具明显植烷优势。这些实验结果表明龙潭组页岩母质来源主要为低等水生生物和陆源高等植物，而龙潭组煤和炭质泥岩以陆源有机质输入为主，在母质来源特征上与龙潭组页岩具有很大的差别。

关键词: 页岩, 地球化学特征, 上二叠统龙潭组, 四川盆地

Abstract:

Through geochemical analysis of core and outcrop source rocks from the Upper Permian Longtan Formation in Sichuan Basin,organic matter type and redox depositional conditions were discussed through organic carbon and biomarker characteristics.The results show that the content of TOC and TOS has fluctuation in the profile,showing obvious heterogeneity.The n-alkanes in coal and carbonaceous mudstone of Upper Permian Longtan Formation are mainly unimodally distributed with relatively high abundance of high carbon number n-alkanes.However,the n-alkanes in shale of Upper Permian Longtan Formation are mainly bimodally distributed with phytanic advantage,and the main peak of the front mode was at nC17,in contrast,the main peak of the back mode was at nC25 or nC27.These results indicate that the organic matter in Longtan shale is mainly of aquatic and continental organic matter input,whereas the organic matter in Longtan coal and mudstone are terrestrial organic matter input.

Key words: Shale, Geochemical characteristics, Upper Permian Longtan Formation, Sichuan Basin

中图分类号: 

  • TE122.1

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