石油实验地质2025，Vol.47Issue(5)：1090-1105,16.DOI:10.11781/sysydz2025051090
鄂尔多斯盆地中东部石炭系本溪组煤岩元素富集特征及成因
Element enrichment characteristics and genesis of coal rocks in Carboniferous Benxi Formation,central and eastern Ordos Basin
摘要
Abstract
Ten coal samples from two wells in the barrier island-swamp and lagoon-swamp depositional systems of the Carboniferous Benxi Formation in the central and eastern Ordos Basin were analyzed for major elements,trace elements,and industrial components to investigate the elemental enrichment characteristics and genesis of coal rocks under different depositional systems.The results indicated that in both depositional systems,the industrial components and the contents of major and trace elements in coal rocks are primarily controlled by the coal-forming environmental conditions.The elemental compositions are mainly influenced by provenance from the northern orogenic belt,marine depositional environments,and magmatic activities.In the barrier island-swamp depositional system,the major elements are dominated by Si and Al,which show strong correlations with ash content and originate from various clay minerals derived from the northern orogenic belt.The trace elements are mainly of inorganic origin.Elements such as Li and Zr show significant correlations with ash content,Si,and Al,indicating that they are primarily derived from terrigenous debris inputs of aluminosilicates.Sr is derived from clay minerals and volcanic rocks.Cu and Cr have mixed origins from volcanic debris and marine apatite.Be,V,and Cd originate from humic acids.In the lagoon-swamp depositional system,the major elements are also dominated by Si and Al.However,Mg,Ca,Mn,and P show weak correlations with ash content,Si,and Al,indicating that these elements are derived from the deposition and burial of higher plants.The trace elements are primarily of inorganic origin.Li and Sr originate from provenance inputs and organic minerals in marine sediments,respectively.Be,Ga,and related elements are of inorganic origin and are sourced from terrigenous debris such as feldspar,quartz,and clay minerals.Cu,Sr,and related elements are primarily derived from marine pyrite,apatite,and other minerals,or are enriched during diagenetic processes under the influence of seawater.关键词
煤岩元素/灰分/相关性分析/富集特征/沉积体系/鄂尔多斯盆地Key words
elements in coal rock/ash content/correlation analysis/enrichment characteristics/depositional system/Ordos Basin分类
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李渤,张力文,王霄,孙砚泽,王彦卿,孙璐,付德亮,吴陈君..鄂尔多斯盆地中东部石炭系本溪组煤岩元素富集特征及成因[J].石油实验地质,2025,47(5):1090-1105,16.基金项目
中国石油股份公司重大专项"深地煤岩气成藏理论与效益开发技术研究"(2023ZZ18)、陕西省重点研发计划项目(2024SF-YBXM-622)和陕西省三秦英才青年拔尖人才项目联合资助. （2023ZZ18）
