山西嘉乐泉晚石炭-早二叠世8#煤层的煤质和煤岩特征研究

Coal Quality and Coal Rock Characteristics of the Late Carboniferous-Early Permian 8#Coal Seam in Jialequan,Shanxi Province

嘉乐泉矿区为太原西山煤田的一部分,主采煤层8#煤层属于C-P太原组海陆过渡相沉积。通过野外勘查,采用煤岩学、矿物学与煤化学等理论,运用光学显微镜、低温灰化仪和X射线衍射仪等仪器,对山西嘉乐泉晚石炭—早二叠世8#煤层的水分、灰分产率、挥发分产率、全硫、镜质组随机反射率以及矿物组成和有机显微组分进行分析鉴定。研究结果表明:山西嘉乐泉8#煤层属于中灰分、低硫分、中挥发分产率烟煤,灰分产率与水分在煤层剖面的变化规律类似,这与陆源碎屑的供给程度关系密切;含硫份高的煤层受海水影响较强,硫源来自海水的供给,主要由黄铁矿硫组成,含有较少的硫酸盐硫;8#煤层的显微组分主要是基质镜质体,其次是均质镜质体,没有找到凝胶体,在个别煤层中看到少量的结构镜质体和碎屑镜质体。镜质组的含量和分布特征表明原始成煤环境为厌氧的还原条件。

The Jialequan mine is part of the Taiyuan Xishan coalfield,and the main mining seam 8#coal belongs to the C-P Taiyuan Group sea-land transition phase deposits.Through the field investigation,the moisture,ash yield,volatile fraction yield,total sulfur,random reflectance of the specular group,mineral composition and organic microfraction of the Late Carboniferous—Early Permian 8#coal seam in Jialequan,Shanxi were analyzed and identified by using the theories of coal petrology,mineralogy and coal chemistry,and instruments such as optical microscope,low temperature ash meter and X-ray diffractometer.The results show that the 8#coal seam of Jialequan,Shanxi Province,is a medium-ash,low-sulfur,medium-volatile-content bituminous coal,with similar patterns of variation of ash yield and moisture in the seam profile,which is closely related to the degree of supply of land-derived debris;the coal seam with high sulfur content is strongly influenced by seawater,and the sulfur source is supplied from seawater,mainly composed of pyrite sulfur and containing less sulfate sulfur;the microfractions of the 8#coal seam are mainly matrix specular bodies,followed by homogeneous specular bodies,no gel was found,and a small amount of structural specular bodies and fragmented specular bodies were seen in individual coal seams.The content and distribution characteristics of the specular group indicate that the original coal-forming environment was anaerobic reducing conditions.