东营凹陷樊页1井沙河街组烃源岩元素地球化学特征及其地质意义

发布时间：2018-02-13 00:40

本文关键词： 烃源岩主量元素微量元素湖泊演化沙河街组东营凹陷　出处：《油气地质与采收率》2017年05期 　论文类型：期刊论文

【摘要】：为明确东营凹陷樊页1井沙河街组烃源岩元素地球化学特征及其地质意义,对其主量和微量元素组成进行系统分析。根据不同元素含量与Al_2O_3等含量的相关性,将其分为3种类型:第1种类型包括Al,Ti,K,Co,Cr,Ga和V等,以陆源碎屑来源为主;第2种类型包括Ca,Mg,Mn和Sr等,以水成来源为主;第3种类型包括Na,Fe,Cd,Ni,Pb,Ba和Zn等,具有多元复杂来源。根据元素来源的差异,优选CaO/Al_2O_3,Sr/Al_2O_3,Sr/Ba和V/(V+Ni)这4个参数,建立综合地球化学剖面,根据各参数在剖面中的变化分析沙河街组烃源岩沉积环境的演变。从沙四段上亚段—沙三段中亚段,水成来源元素富集程度逐渐下降,湖水盐度逐渐降低,底水还原性逐渐减弱。根据各参数纵向差异及变化特征,将沙四段上亚段和沙三段下亚段划分为4个更小的沉积单元,其古盐度和底水的氧化、还原条件存在明显的差异。
[Abstract]:In order to clarify the element geochemical characteristics and geological significance of source rocks in Shahejie formation of Fan Pai 1 well in Dongying Sag, the principal and trace element compositions are systematically analyzed. According to the correlation between the content of different elements and the content of Al_2O_3, etc. It can be divided into three types: the first type is composed of Allene Ti-Ki, CoCo-Cr-Ga and V, mainly from continental clastic sources, the second type includes Caomg mn and Sr, mainly from water sources, and the third type includes Nafeime, CdCU, NiNiPbnb, Ba, Zn, and so on, and the second type is composed of Caomg, mn, Sr, and so on. There are multiple complex sources. According to the difference of element sources, the four parameters of Cao / Al _ 2O _ 3Sr / Al _ 2O _ 3 Sr _ r _ Ba and V _ P _ V _ Ni are selected to establish a comprehensive geochemical profile. According to the variation of the parameters in the profile, the evolution of the sedimentary environment of source rock in Shahejie formation is analyzed. From the upper submember of Shahejie formation to the middle part of the third member of Shahejie formation, the enrichment degree of hydrogenic source elements decreases gradually, and the salinity of lake water decreases gradually. According to the longitudinal difference and variation characteristics of the parameters, the upper submember and the lower submember of Shahejie formation are divided into four smaller sedimentary units, and the paleosalinity, redox and reduction conditions of the bottom water are obviously different.
【作者单位】：中国石化胜利油田分公司勘探开发研究院;
【基金】：国家科技重大专项“渤海湾盆地剩余油气资源潜力研究”(2016ZX05006-001) 中国石化油气勘探开发领域重大项目“济阳坳陷油气聚集规律与精细评价关键技术”
【分类号】：P618.13

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