王洼矿区8#煤层煤质特征及成煤环境分析

Coal Quality Characteristics and Coal-forming Environment of 8#Coal Seam in Wangwa Mining Area

通过对王洼矿区8#煤层7个勘查报告中的煤质资料进行分析,发现研究区的沉积环境对其煤岩特征和化学特征控制程度较高。研究发现:在延安组初期,8#煤层主要在浅湖三角洲体系下形成,这个阶段的沉积环境相对较稳定;在延安组后期,受到古河流的冲刷影响,沉积环境由浅湖三角洲体系转变为河流体系,在古河流的冲刷下,8#煤层的硫分、灰分和显微组分的分布具有一定的变化;在燕山运动后期,西侧沉积边界逐渐抬升,煤层埋深西高东低,随着埋深的增加,挥发分逐渐降低。对王洼矿区8#煤层的煤质资料进行分析后,对成煤环境有了一定的认识,得出王洼矿区8#煤层煤岩特征和化学特征受到沉积环境控制的结论。

Through the analysis of coal quality data in seven exploration reports of 8#coal seam in Wangwa mining area,it is found that the sedimentary environment in the study area has a high degree of control over its coal-rock characteristics and chemical characteristics.It is found that the 8#coal seam was mainly formed in the shallow lake delta system at the early stage of Yan'an Formation,and the sedimentary environment at this stage is relatively stable;in the late Yan'an Formation,the sedimentary environment changed from a shallow lake delta system to a river system due to the erosion of the ancient river;under the erosion of the ancient river,the distribution of sulfur,ash and maceral in the 8#coal seam changed to a certain extent;in the late Yanshan movement,the sedimentary boundary on the west side gradually rose,and the buried depth of coal seam was higher in the west and lower in the east,with the increase of buried depth,the volatile content gradually decreased.After analyzing of coal quality data of 8#coal seam in Wangwa mining area,a certain understanding of the coal-forming environment has been gotten,and the conclusion is drawn that the coal rock characteristics and chemical characteristics of 8#coal seam in Wangwa mining area are controlled by the sedimentary environment.