魏建设,姜亭,王宝文,张云鹏,苏琼.银额盆地居延海坳陷吉格达凹陷石炭系—二叠系烃源岩生物标志化合物特征及其意义[J].西北地质,2020,53(3):273-283 WEI Jianshe,JIANG Ting,WANG Baowen,ZHANG Yunpeng,SU Qiong.The Biomarker Characteristics and Its Significance of the Carboniferous-Permian Source Rocks in Jigeda Sag of Juyanhai Depression in Yin'er Basin[J].Northwestern Geology,2020,53(3):273-283
银额盆地居延海坳陷吉格达凹陷石炭系—二叠系烃源岩生物标志化合物特征及其意义
The Biomarker Characteristics and Its Significance of the Carboniferous-Permian Source Rocks in Jigeda Sag of Juyanhai Depression in Yin'er Basin
投稿时间:2020-01-02  修订日期:2020-03-04
DOI:10.19751/j.cnki.61-1149/p.2020.03.025
中文关键词:  银额盆地;居延海坳陷;吉格达凹陷;石炭系—二叠系;烃源岩;生物标志化合物;沉积环境
英文关键词:Yin'er basin;Juyanhai depression;Jigeda sag;Carboniferous-Permian;source rocks;biomarker;sedimentary environment
基金项目:国家科技重大专项“西北地区中生界陆相典型页岩气赋存方式与富集规律研究(2016ZX05034001-006)”,陕西省自然科学基金“柴北缘侏罗纪盆地构造演化关键问题研究:以红山地区为例(2018JM4031)”,中国地质调查局“关中地区氦气资源调查(DD20190103)”和“河套盆地及外围油气资源战略调查(DD20190711)”项目联合资助
作者单位
魏建设 中国地质调查局西安地质调查中心/西北地质科技创新中心, 陕西 西安 710054 
姜亭 中国地质调查局西安地质调查中心/西北地质科技创新中心, 陕西 西安 710054 
王宝文 中国地质调查局西安地质调查中心/西北地质科技创新中心, 陕西 西安 710054 
张云鹏 中国地质调查局西安地质调查中心/西北地质科技创新中心, 陕西 西安 710054 
苏琼 中国地质调查局西安地质调查中心/西北地质科技创新中心, 陕西 西安 710054 
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中文摘要:
      生物标志化合物特征对烃源岩有机质来源、沉积环境及热演化程度等具有很好的指示意义。通过对吉格达凹陷蒙额参3井下二叠统—上石炭统干泉组、中下二叠统烃源岩气相色谱、气相色谱-质谱等分析表明,下二叠统—上石炭统干泉组上段及中下二叠统烃源岩正构烷烃峰范围较宽,抽提物饱和烃组分中轻质组分要大于重质烃类,低碳数烃占据主导,萜类化合物以三环萜烷为主,四环萜烷含量较低。这些生物标志化合物特征表明,石炭系—二叠系烃源岩有机质母源以浮游生物为主,同时存在高等植物的贡献,石炭系水体更深,石炭系烃源岩浮游植物的贡献更大,陆源高等植物的贡献较小。OEP和CPI指示干泉组和中下二叠统烃源岩为奇偶均势的特点,指示干泉组和中下二叠统烃源岩处于成熟阶段,且石炭系干泉组烃源岩演化程度略高于中下二叠统。姥鲛烷(Pr)和植烷(Ph)的分布特征表明,干泉组上段烃源岩处于还原环境,中下二叠统烃源岩处于强还原-还原环境。
英文摘要:
      The biomarker characteristic indicates the sources of organic matter, sedimentary environment and the thermal evolution of the source rocks. the analysis of the source rocks of Ganquan Formation of lower Permian-upper Carboniferous and middle lower Permian system in Mengecan 3 well of Jigeda sag by GC and GCMS shows that, the peak range of n-paraffins of the source rocks of the lower Permian-upper Carboniferous upper Ganquan formation and middle lower Permian is wider. The light-component in the saturated hydrocarbon component of the extracts is larger than the heavy one. Low carbon hydrocarbon dominates. Terpenes are mainly tricyclic ones and the content of tetracyclic terpenes is low. The organic matter of Carboniferous-Permiansystem source rock is mainly plankton, and some contributions of higher plants, while the Carboniferous has more plankton and less land-higher plants. OEP and CPI indicate that the source rocks of Ganquan Formation and middle lower Permian are even-odd potential and in a mature stage. the degree of evolution of Carboniferous is slightly higher than middle lower Permian. The distribution characteristics of Pristane and phytane show that the source rocks of upper Ganquan Formation are in a reducing environment, and those of the middle lower Permian are in a strong reducing- reducing environment.
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