黔西松河矿区煤中元素地球化学特征及成煤环境意义

发布时间：2018-04-11 18:37

本文选题：常量元素 + 微量元素　；参考：《煤炭科学技术》2017年12期

【摘要】：为查明黔西松河矿区煤中元素的富集程度及富集成因,以松河矿区龙潭组上、中、下煤组9层主采煤层为研究对象,利用煤炭勘查报告中煤质化学成分及煤中Cu、Co、Ni、Sr、Be、Ba、V等7种微量元素质量分数等参数,对主要煤层的元素地球化学特征进行了研究,并依常量元素和微量元素的含量及比值探讨了龙潭组不同含煤层段成煤环境差异。结果表明:该区煤层常量元素氧化物以SiO2、Al_2O_3和Fe_2O_3为主,CaO次之,各常量元素丰度总体与中国煤均值相似;煤中微量元素Cu、Co、Ni、Sr、Be、Ba和V的质量分数,不但高于黔西煤均值,而且显著高于中国煤均值和世界煤均值,其中V尤为富集。灰成分指数(Fe_2O_3+CaO+MgO)/(SiO2+Al_2O_3)、Sr/Ba、Ni/Co及S的质量分数在龙潭组上、中、下煤组煤层中呈现高-低-高的变化规律,反映龙潭组上、下煤组煤层成煤时受海水影响较大,而中煤组煤层成煤时受海水影响较小。
[Abstract]:In order to find out the enrichment degree and origin of elements in the coal of Songhe mining area in western Guizhou, the 9 layers main coal seam of Longtan formation, middle coal group and lower coal formation in Songhe mining area were taken as the research object.Based on the chemical composition of coal in the coal exploration report and the mass fraction of seven trace elements, such as Cu-Co-Ni-Ni-Li, SrBeBe-Ba-V, etc., the geochemical characteristics of elements in main coal seams are studied.According to the contents and ratios of constant elements and trace elements, the difference of coal forming environment in different seam bearing sections of Longtan formation is discussed.The results show that the major element oxides in coal seams in this area are SiO2Al2O3 and Fe_2O_3, and the abundance of each major element is similar to the average value of coal in China, and the mass fraction of the trace element CuO2Al2O3 and Fe_2O_3 is not only higher than the average value of coal in western Guizhou.Moreover, it is significantly higher than the average value of coal in China and in the world, among which V is especially enriched.The ash composition index, Fe2O3 CaO MgO)/(SiO2 Al2O3, the mass fraction of Sr- / Ba-Ni / Co and S in the Longtan formation, the coal seam of middle and lower coal groups shows a high, low and high variation rule, which indicates that the coal seam of the lower coal group is greatly influenced by seawater when it is formed in the Longtan formation.The medium coal seam is less affected by sea water during coal formation.
【作者单位】：贵州省煤层气页岩气工程技术研究中心;贵州省煤田地质局;中国石化石油工程技术研究院;煤炭科学研究总院;
【基金】：国家科技重大专项资助项目(2016ZX05034004—007,2016ZX05044001-005)
【分类号】：P618.11

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