详文请见：沉积学报,2008,26(6)：925-932

东营凹陷古近系中深层湖盆演化中的无机元素响应

陈中红 等

为查明无机元素分布与水深、盐度等沉积环境以及湖盆演化过程的关系，采用电感耦合等离子体发射光谱仪分析对东营凹陷郝科1科探井古近系深层微量元素含量进行了测试、分析，所涉及的研究层位是该凹陷的主要烃源岩层段（沙河街组三亚段、沙河街组四亚段、孔店组），分析结果表明：在水体浅、蒸发作用强烈的孔店组-沙四下亚段强氧化性滨浅湖环境里，钙、锶含量和Ca/Mg、Sr/Ba、Sr/Ca参数值具低值响应，铁、铝、钡、钒含量和（Fe+Al）/(Ca+Mg)参数值具高值响应；在沙四中亚段膏岩、盐岩等普遍发育的盐湖环境中，钠、锶含量和Sr/Ba、Fe/Mn、Sr/Ca均出现高值响应，锰、钡、钒含量和V/Ni、(Fe+Al)/(Ca+Mg)出现低值响应；在还原性的沙四上亚段半咸化深湖环境中，钾、钠、铁含量和Fe/Mn值具低值响应，钙、锰含量具高值响应；在沙四中亚段膏盐与泥岩共生体系中元素分布离散性明显，呈现波动性特征； Sr/Ba、Sr/Ca在盐湖环境中出现显著的高值响应，被证实可以作为良好的水体盐度指标参数，Fe/Mn、 (Fe+Al)/(Ca+Mg)随水体加深逐渐增大，是良好的水体深浅指标参数。元素分布受沉积环境、岩性特征等多种地质因素的影响，在利用元素含量分布及特征元素比值来判断某单个地质因素的变化时，应该应用多种参数，进行综合判断。

关键词：无机元素响应；元素比值参数；湖盆演化；盐湖；东营凹陷

Mineral Elemental Response to the evolution of Terrestrial Brine Faulted-basin

Chen Zhonghong, et al

Sedimentology ,2008,26(6)：925-932

In order to investigate the relation between the distribution of mineral elementals and sedimentary environment including the salinity and depth of water body, and the evolution of lake-basin, emission spectrograph of inductive coupling plasma was used to intensively testing and dissection the content of mineral elements in the deep death of the Paleogene from the Well Haoke-1 in Dongying sag. The involved formation contained the Member 3, Member 4 of Shahejie Formation and Kongdian Formation, in which the main source rocks distributed. The results demonstrate that: in the oxidized sedimentary environment of shallow shore-lacustrine the content of Sr, Ca and the parameters of Ca/Mg, Sr/Ba, Sr/Ca have low value response, the content of Fe, Al, Ba, V and the parameter of (Fe+Al)/(Ca+Mg) have high value response; in the brine-lake sedimentary environment the content of Mn, Ba,V and the parameters of V/Ni, (Fe+Al)/(Ca+Mg) have low value response, the content of Sr, Na and the parameters of Sr/Ba, Fe/Mn, Sr/Ca have high value response; in the reductive brackish sedimentary environment of half-deep lacustrine lake the content of K, Na, Fe and the parameters of Fe/Mn have low value response, the content of Ca, Mn have high value response. In the co-sedimentary environment of saline deposit and mud of the middle part of Sha-4 Formation, the distribution of mineral elements has obvious characteristics of discretion and fluctuation. Sr/Ba, Sr/Ca have obvious high value response in the saline lake and are verified to be good parameters for salinity of water-body. The parameters of Fe/Mn and (Fe+Al)/(Ca+Mg) are approved to be good parameters for the depth of water-body and their value increased with deepening of water-body. The parameters above-mentioned should be applied and synthetically analyzed to determining characteristics of geological factors for the parameters were influenced by many geological factors including sedimentary environment and lithologic character.

Key words: response of mineral element, ration of mineral element, evolution of basin, brine lake, Dongying sag

 

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