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四川广元上寺剖面上二叠统大隆组优质烃源岩发育主控因素初探*

DOI: 10.7605/gdlxb.2011.03.011, PP. 347-354

Keywords: 广元上寺剖面,烃源岩,微量元素,上升流,上二叠统,大隆组

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Abstract:

对四川广元上寺上二叠统剖面进行岩石学和地球化学分析,并利用Al/Ti值评估古生产力,而利用Mo、U、V、Cr、V/Cr和V/(V+Ni)来评估沉积环境,进而探讨烃源岩中有机质的积累与海洋初级生产力、沉积环境(氧化还原条件)以及沉积速率之间的关系。研究发现,在大隆组中部,TOC、过剩铝、Cu、Ni和Cd出现高值(TOC平均值为5.82%),具备优质烃源岩特征。对该段地层的生物地球化学分析表明,氧化—还原敏感元素Mo、U、V、Cr丰度高,V/Cr>4.25和V/(V+Ni)>0.7指示长期的厌氧沉积环境;而此时Al/Ti则指示只有中等的古生产力。低的沉积速率可能是有机质浓缩的主要原因。与上地壳平均页岩相比,大隆组中部明显富集Cd、P、Mo、U、Cu、Ni、V和Zn,亏损Co和Mn,显示出与现代上升流发育区近似的微量元素地球化学特征,指示该烃源岩层发育于上升流盛行的地区。

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