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Influence on Formation of Yuertusi Source Rock by Hydrothermal Activities at Dongergou Section, Tarim Basin
Author(s): 
Pages: 803-810
Year: Issue:  4
Journal: Acta Sedimentologica Sinica

Keyword:  hydrothermal activitysource rockYuertusi FormationTarim Basin;
Abstract: 研究热液活动是否会破坏烃源岩的形成.对塔里木盆地东二沟剖面玉尔吐斯组进行地球化学分析,利用δEu、Fe/Ti和(Fe +Mn)/Ti比值研究热液活动,Al/Ti比值替代古生产力,V/Cr、V/(V+Ni)和Ni/Co比值代表氧化还原环境,进而探讨热液活动与占生产力、氧化还原条件以及有机质含量之间的关系.玉尔吐斯组沉积时古生产力水平较低,为贫氧—厌氧环境,下部具有较强的热液活动,中上部热液活动较弱.下部的热液活动虽然促进了古生产力的提高,但TOC含量整体较低,为0.01%~3.58%,平均值为0.64%;中上部热液活动较弱,古生产力水平较低,TOC含量却较高,为0.06% ~ 12.19%,平均值为8.95%,是较好的烃源岩层.岩石薄片显示,与热液活动相关的硅质岩中含有大量的藻类.研究结果表明,较强的热液活动会带来大量的富硅流体,稀释沉积物中的有机质,对烃源岩的形成起破坏作用.
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