吐哈盆地大南湖矿区煤岩煤质特征及成煤环境分析

Analysis of coal rock and coal quality characteristics and coal forming environment in Dananhu mining area in Turpan-Hami Basin

吐哈盆地大南湖矿区煤炭资源丰富,采用煤岩学、煤化学等研究方法,通过资料收集和煤层剖面采样测试,对研究区侏罗系中统西山窑组25号煤层煤质、煤岩及煤相特征进行了分析研究,并探讨了聚煤规律。研究结果表明,大南湖矿区25号煤层属于特低灰、高挥发分、低硫煤;煤岩显微组分以富惰质组为主,其次为镜质组;煤层共经历了干燥森林沼泽及较干燥森林泥炭沼泽、较潮湿森林泥炭沼泽、干燥森林泥炭沼泽、潮湿草本沼泽、干燥森林泥炭沼泽5个演化阶段。

Dananhu mining area in Turpan-Hami Basin is rich in coal resources.Using coal petrology,coal chemistry and other research methods,through data collection and coal seam profile sampling and testing,the characteristics of coal quality,coal rock and coal facies of No.25 coal seam of Xishanyao Formation,Middle Jurassic in the study area were analyzed and studied,and the law of coal accumulation was discussed.The results showed that the coal of No.25 coal seam in Dananhu mining area belonged to ultra-low ash,high volatile and low sulfur coal;The macerals of coal were mainly inertinite rich,followed by vitrinite;from bottom to top,the coal seam had experienced five evolutionary stages:dry forest swamp,relatively dry forest peat swamp,relatively wet forest peat swamp,dry forest peat swamp,wet herb swamp and dry forest peat swamp.