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科技导报  2015 

湘西碳沥青若干微量元素地球化学特征

DOI: 10.3981/j.issn.1000-7857.2015.16.007, PP. 51-55

Keywords: 湘西,碳沥青,微量元素

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Abstract:

为分析碳沥青的微量元素地球化学特征,采用ElementXR等离子体质谱分析仪及对选取的碳沥青样品进行测试。结果显示,碳沥青的微量元素丰度与页岩、围岩差异明显,其中V(1039.40μg/g)、Ni(345.90μg/g)、Sr(227.67μg/g)和Mo(64.70μg/g)显著富集。对以上4种元素的赋存和富集模式进行分析,结果表明元素V和Ni在碳沥青中富集的主要原因包括,继承了原油微量元素特征、较强的螯合作用和油气演化3个方面,在本身绝对含量不减或微增的情况下,其他元素和有机质总量的亏损在一定程度上突出了V和Ni的相对富集;Mo与V、Ni具有相似的赋存和富集机理,Sr的富集可能与油气运移过程中对地层中Sr的溶解和储层热演化过程中的有机质络合作用有关,但是也可能与Sr尚不明确的地球化学行为有关。

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