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天然气地球科学 ›› 2012, Vol. 23 ›› Issue (4): 636–645.doi: 10.11764/j.issn.1672-1926.2012.04.636

• 天然气地球化学 • 上一篇    下一篇

柴达木盆地乌南—绿草滩地区烃源岩地球化学特征

张明峰，妥进才，张小军，吴陈君，陈茹，郭力军   

  1. 1.中国科学院地质与地球物理研究所，中国科学院油气资源研究重点实验室，甘肃 兰州 730000;
    2.中国石油勘探开发研究院西北分院，甘肃 兰州 730020;
    3.中国石油青海油田分公司勘探开发研究院，甘肃 敦煌 736202
  • 收稿日期:2012-05-04 修回日期:2012-07-06 出版日期:2012-08-10 发布日期:2012-08-10
  • 通讯作者: 张明峰zhangmingfeng_9@hotmail.com. E-mail:zhangmingfeng_9@hotmail.com.
  • 作者简介:张明峰(1979-)，男，甘肃兰州人，助理研究员，博士，主要从事地球化学和油气地球化学研究. E-mail：zhangmingfeng_9@hotmail.com.
  • 基金资助:

    国家自然科学基金（编号：41103022）;国家重点基础研究发展计划（“973”）项目（编号：2012CB214705）;中国科学院油气资源研究重点实验室开放基金（编号：KFJJ2010-08）联合资助.

Geochemical Characteristics of the Source Rocks from Wunan Lücaotan area in Qaidam Basin

ZHANG Ming-feng, TUO Jin-cai, ZHANG Xiao-jun, WU Chen-jun, CHEN Ru, GUO Li-jun   

  1. 1.Key Laboratory of Petroleum Resources Research，Institute of Geology and Geophysics，
    Chinese Academy of Sciences,Lanzhou 730000,China;2.Northwest Branch,Research Institute of 
    Petroleum Exploration and Development,PetroChina,Lanzhou 730000,China;3.Research Institude
    of Petroleum Exploration and Development,Qinghai Petroleum Administration,PetroChina,Dunhuang 736202,China
  • Received:2012-05-04 Revised:2012-07-06 Online:2012-08-10 Published:2012-08-10

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摘要：

依据烃源岩有机质丰度、有机质类型和有机质成熟度分析，发现乌南—绿草滩地区较好—好烃源岩主要分布在下干柴沟组上段和下干柴沟组下段。烃源岩生物标志化合物主要特征为正烷烃系列中—低碳数（15~19）出现偶碳数优势，高碳数（25~29）表现为奇数碳优势。萜类化合物表现出高伽马蜡烷—高三环萜和低伽马蜡烷—低三环萜2种类型，C34、C35升霍烷含量较低，甾烷既有C27优势，也有C29优势。反映烃源岩发育区主要处在深湖相带与滨浅湖相带之间的过渡相带，水生生物与陆源高等植物有机质生源各有一定比例。值得关注的是，在绿参1井不同深度的5个古近系—新近系烃源岩样品，在其芳烃馏分中均检测到三联苯系列化合物，发现三联苯系列中不同取代位置的同分异构体相对含量和烃源岩中有机质的热演化程度表现出很好的正相关性，成为氯仿沥青“A”芳烃馏分中判识烃源岩有机质热演化程度的有意义参数。

关键词: 柴达木盆地, 乌南—绿草滩地区, 烃源岩, 生物标志化合物, 三联苯

Abstract:

According to abundance and type of organic matter and its thermal maturity,we consider that the upper and lower sections of lower Ganchaigou Formation belonged to good and better source rock.The biomarker features of n-alkenes for source rocks show an even-to-odd (15-19) and odd\|to\|even (25-29) predominance.Terpenoids are characterized as high γ-and tricyclic diterpene,low γ-and tricyclic diterpene,low abundance of C34and C35hopanes,and C27>C29 or C29>C27 for steranes.All of geochemical parameters suggest that the organic matter was derived from aquatic organisms and higher plants in the transition zone between deep and shallow lacustrine depositional settings.It should be noted that the occurrence of one terphenyl compounds in the aromatic hydrocarbons from 5 source rocks (Lücan 1 well) sampling at different depth,and the relative abundance of each isomers is positively related to thermal maturity,20S/(20S+20R) ratio of C29 steranes,and RO values.So the relative abundance of each isomer would be a potential parameter for indicating thermal maturity of organic matter.

Key words: Qaidam basin, Wunan-Lücaotan area, Source rock, Biomarkers, Terphenyls

中图分类号: 

  • TE122.1+13

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