摘要
为了提供戴家田煤矿成煤期的沉积环境理论依据,对该矿区煤层煤岩类型及其煤质特征进行研究以反演矿区所属区域成煤时期的覆水情况、氧化还原环境等沉积环境特征。采用沉积学、地球化学和煤岩学相结合的方法,通过取样鉴定、化验测试及综合分析处理手段,细致分析了戴家田矿区煤的煤岩类型、主要煤质特征与成煤环境的关系。发现研究区内煤层煤岩类型以镜质组为主,镜质组的形成环境与强覆水、气流不畅的封闭泥炭沼泽有关;硫分垂向上的变化趋势可推测区域地质历史上可能发生了较大的海侵和海退事件,硫分的高低与泥炭沼泽受海水影响的程度有直接关系。受到海水影响较强的煤层,其宏观煤岩类型以半亮煤为主,微观煤岩类型以微镜堕煤占绝对优势;煤层的其它煤质特征也表现出灰分低、全硫含量高等特点。
In order to provide the theoretical basis for the sedimentary environment in the coal forming period of Daijiatian coal mine,the types of coal seam rocks and the characteristics of coal quality in the mining area were studied,this study could also invert the sedimentary environment characteristics such as the water covering situation and the redox environment in coal forming period of mining area.By means of combination of sedimentology,geochemistry and coal petrology,and through means of sampling identification,laboratory test and comprehensive analysis,the relationship between coal petrology type,main coal quality characteristics and coal forming environment was analyzed in detail.The main type of coal seam in this study area is vitrinite,the formation environment of vitrinite is related to closed peat swamp with strong water cover and poor air flow;from the vertical variation trend of sulfur content,there may be major transgression and regression events in regional geological history,the level of sulfur content is directly related to influencing degree of sea water on peat swamp.For coal seam which was strongly affected by sea water,the macro type of coal rock is mainly semi bright coal,while the micro type of coal rock is dominated by micro vitrinertite;other coal quality characteristics of coal seam also show low ash content and high total sulfur content.
作者
蒋红兵
杨磊
梁剑
JIANG Hongbing;YANG Lei;LIANG Jian(Geological Team of Coal Mine Exploration of Guizhou Province,Guiyang 550081,China)
出处
《煤质技术》
2020年第2期52-58,共7页
Coal Quality Technology
关键词
煤质特征
成煤环境
煤岩类型
镜质组
半亮煤
戴家田煤矿
coal quality characteristics
coal forming environment
coal petrology type
vitrinite
semi bright coal
Daijiatian coal mine
