伊宁煤田八道湾组与西山窑组煤质特征对比研究

Comparison of Coal Quality Between Badaowan Formation and Xishanyao Formation in Yining Coalfield, Xinjiang

据煤岩和煤化测试结果,对研究区八道湾组和西山窑组煤质特征进行对比。结果表明,八道湾组煤以高镜质组含量、高挥发分产率、低灰分产率及中水分含量为特征;西山窑组煤以高惰质组含量、中挥发分产率、特低灰分产率及中高水分含量为特征。挥发分产率的倒转(八道湾组高于西山窑组)归因于八道湾组高镜质组含量及矿物含量。八道湾组煤相类型主要为潮湿森林沼泽相,西山窑组主要为干燥森林沼泽相。分析认为,煤质特征差异归因于成煤期盆地基底沉降速率的差异,八道湾组成煤期基底较快的沉降速率使泥炭沼泽具低位沼泽特征,西山窑组成煤期基底较慢的沉降速率使其具高位泥炭沼泽特征。

Comparison in coal quality between Badaowan formation and Xishanyao formation reveals that Badaowan formation coal is characterized by high vitrinite content, high volatile yield, low ash yield and medium moisture content and Xishanyao formation coal is characterized by high inertinite content, medium volatile yield, special low ash yield and medium-high moisture content. The coal facies is wet forrest swamp and dry forrest swamp during Badaowan formation and Xishanyao formation period, respectively. The difference in coal quality between Badaowan formation and Xishanyao formation is ascribed to the difference in subsidence rate of basin base. The swamp is eutrophic because of a relatively high subsidence rate during Badaowan formation and is oligotrophic because of a relatively slow subsidence rate during Xishanyao formation.