The Biomarker Characteristics and Its Significance of the Carboniferous-Permian Source Rocks in Jigeda Sag of Juyanhai Depression in Yin'er Basin
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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。Abstract: 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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Key words:
- Yin'er basin /
- Juyanhai depression /
- Jigeda sag /
- Carboniferous-Permian /
- source rocks /
- biomarker /
- sedimentary environment
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