柴达木冷科1井不同沉积环境元素地球化学特征

Element geochemistry characteristics of different sedimentary environments of Lengke No.1,Caidamu Basin

冷科 1井 30 0 0～ 4 418m泥岩的元素分析数据表明 :不同沉积环境中形成的泥岩 ,其元素的含量明显不同。微量元素 Mn、Rb、Ni、U、V、B、Co、Th和 Ga在湖相泥岩中含量明显增高 ,而在辫状三角洲及河流泛滥平原泥岩中含量较低。常量元素 Ca、K和 Mg在不整合面附近及泛滥平原泥岩中含量较高 ,湖相泥岩中含量低且变化小 ,其中 Ca、Mg表现的尤为明显。沼泽相泥岩中所有元素含量均最低。冷科

The data of elementary analysis of the shale from Lengke l at depth of 3,000 4,418 meter shows that the shale from different sedimentary environments has obvious different content of elements.The content of trace elements Mn?Rb?Ni?U?V?B?Co?Th and Ga is obviously higher in the limnic shale,while the content in the shale of braided stream delta and flood plain is relatively low.The content of constant elements Ca?K and Mg is relatively higher near the unconformity surface and the shale of flood plain,while the content in the limnic shale is lower and has small change,especially Ca and Mg.In the marsh shale,all the elements have the lowest content.The data of elementary analysis from Lengke l indicates that element geochemistry can be used as one of the methods to identify the sequence stratigraphic interface.