静禹钱,雷闯,刘克栋,李振华

• 1:中国石油大学(北京)油气资源与探测国家重点实验室
• 2:华北理工大学矿业工程学院
• 3:山东省核工业二四八地质大队
• 4:东营市市场监督管理局

摘要(Abstract)：

为深入认识南堡凹陷沙河街组富有机质泥页岩形成机理，通过详细分析微量和稀土元素地球化学特征，对其水体沉积环境及物源进行研究。结果表明：微量元素Li, Cs, Bi较为富集；Cr, Sn较为亏损；其他微量元素接近于上地壳元素含量。稀土元素总量变化范围宽泛，接近或高于大陆上地壳的平均值，指示陆源碎屑供给较为充足。REE分配模式表现为轻稀土元素富集，分异程度较高；重稀土元素相对亏损，分异程度较低。铕元素异常值(δEu)负异常明显，铈元素异常值(δCe)基本正常。根据锶丰度和锶/钡比值的变化，反映出沙三段沉积时期湖泊水体具有一定的分隔性，淡水、半咸水和咸水环境共存；沙一段沉积时期湖泊水体的连通性增强，以半咸水环境为主。根据V/(V+Ni)、Th/U比值及δCe、铈异常指数(Ce_(anom))值特征，反映出湖泊水体为分层较强的贫氧环境。源生Ba含量揭示出湖泊水体古生产力较高。通过稀土元素组合特征分析，认为沙河街组物源主要来自燕山褶皱带于燕山期发育的花岗岩，且混有少量沉积岩。南堡凹陷沙河街组泥页岩有机质富集程度与其古环境和古地理密切相关：一是适宜的水体古盐度和丰富的水体营养物质适应多种浮游藻类的共同繁盛，提高了湖泊水生有机质生产效率；二是贫氧的水体环境减缓有机质在埋藏过程中的降解，提高了沉积有机质保存效率。

关键词(KeyWords)： 南堡凹陷;沙河街组;微量元素;稀土元素;沉积环境;物源

Abstract:

Keywords:

基金项目(Foundation): 国家科技重大专项子课题(2016ZX05006-006);; 油气资源与探测国家重点实验室开放课题(PRP/open-2004)

作者(Author): 静禹钱,雷闯,刘克栋,李振华

DOI: 10.19509/j.cnki.dzkq.2022.0131

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