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    渤海湾盆地石炭-二叠系微量元素特征及其指相意义

    Trace element signatures of the Carboniferous -Permian deposits in the Bohai Gulf Basin and their facies significance

      摘要
    • 摘要: 本文采用ICP-MS测试分析技术,对渤海湾盆地4口钻井42件石炭-二叠系岩心样进行了Sr、Ba、Ga、V、Ni、Co等沉积环境敏感元素的系统测试分析,讨论6种元素含量及Sr/Ba、Ba/Ga、Ni/Co等比值的变化特征。除去5件样品中的异常点,测试元素大多数集中的变化范围:Sr (100~200)×10-6,Ba (100~700)×10-6,Ga (10~40)×10-6,V (80~200)×10-6,Co (5~30)×10-6,Ni (15~45)×10-6,Sr/Ba 0.2~0.9,Ba/Ga 2~20,Ni/Co 1~4。根据微量元素指标特点结合岩相资料,认为渤海湾盆地本溪组发育海相沉积,太原组发育过渡相沉积,山西组及其以上地层发育陆相沉积。元素指标中,Ba、Sr/Ba和Ba/Ga沉积环境指示意义显著,在判断渤海湾盆地石炭-二叠纪沉积相方面具有实用价值。

       

      Abstract: The present paper deals with the contents of the elements Sr, Ba, Ga, V, Ni and Co, and the ratios of Sr/Ba, Ba/Ga and Ni/Co analyzed by using ICP-MS technique for 42 pieces of the Carboniferous -Permian core samples from four wells in the Bohai Gulf Basin, and gives the following analyses:Sr=(100~200)×10-6, Ba=(100~700)×10-6, Ga=(10~40)×10-6, V=(80~200)×10-6, Co=(5~30)×10-6, Ni=(15~45)×10-6, Sr/Ba=0.2~0.9, Ba/Ga=2~20, Ni/Co=1~4. The results of research show that the marine deposits are developed in the Benxi Formation, the transitional deposits in the Taiyuan Formation, and the continental deposits in the Shanxi Formation and its overlying strata in the Bohai Gulf Basin.

       

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