渝东漆辽剖面五峰组-龙马溪组页岩及残余干酪根中微量元素地球化学特征
Geochemical Characteristics of Trace Elements of Shales and Their Residual Kerogens from Wufeng-Longmaxi Formations in the Qiliao Section,Eastern Chongqing,China
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文摘
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为探讨渝东漆辽剖面五峰组-龙马溪组页岩及残余干酪根内部微量金属元素的赋存规律及其对页岩气生成的影响,对页岩及残余干酪根中的微量元素进行了分析测试。结果表明,多数微量金属元素在五峰组-龙马溪组页岩干酪根中较页岩中更为富集,稀土元素表现出轻稀土富集,重稀土亏损,明显Eu负异常,轻微Ce负异常的特征; 说明漆辽剖面五峰组-龙马溪组页岩沉积水体为贫氧-缺氧的热水沉积环境,而热水沉积环境正是导致页岩中V、Ni、U高度富集的原因。 |
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其他语种文摘
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In order to investigate the effect on shale gas generation by trace metal elements in shales and their residual kerogens, geochemical characteristics of trace elements shales and their residual kerogens from Upper Ordovician Wufeng and Lower Silurian Longmaxi formations in the Qiliao Section,Eastern Chongqing have been studied in this paper. Results show that most trace metal elements are more enriched in kerogens than in their host shales from Wufeng and Longmaxi formations. REE of shales and their residual kerogens are characterized with the enrichment of LREE and depletion of HREE,with obvious Eu negative anomaly and a slight Ce negative anomaly in their REE patterns. Overall,it is believed that shales of the Wufeng and Longmaxi formations in the Qiliao section was deposited in a weak oxygen depleted or anoxic hot water environment which caused the high enrichment of V,Ni,U in shales. |
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来源
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矿物岩石地球化学通报
,2015,34(6):1231-1237 【核心库】
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DOI
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10.3969/j.issn.l007-2802.2015.06.015
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关键词
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页岩
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微量元素
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五峰组
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龙马溪组
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渝东
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地址
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中国科学院广州地球化学研究所, 有机地球化学国家重点实验室, 广州, 510640
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1007-2802 |
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学科
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地质学 |
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基金
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中国科学院战略性先导科技专项
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文献收藏号
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CSCD:5618073
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