吐哈盆地克尔碱凹陷煤层煤质特征与成煤环境

为了揭示吐哈盆地克尔碱凹陷不同矿区煤质形成条件，探讨该区煤质与成煤环境的关系，基于对主采煤层样品工业分析、有害组分及灰成分指标等数据分析，在对克尔碱凹陷地层分布、含煤岩系特征等基本地质条件分析的基础上，运用煤地质学、煤岩学、煤化学等理论和方法，系统总结凹陷内各矿区煤层赋存特征、煤质特征，探讨区内煤岩煤质与成煤环境的关系。结果表明：研究区自西向东划分6个主要矿区,区内煤层主要发育于中侏罗统西山窑组（J2x）和下侏罗统八道湾组（J1b）地层之中。研究区煤质呈低灰、低硫、高挥发分特征，煤灰成分以SiO2、Al2O3为主。综合分析表明，研究区中-下侏罗统主要煤层形成于湖泊-河流三角洲淡水沉积环境，具陆相成煤特征，成煤环境温暖潮湿。

Coal Quality Features and Coal Forming Environment of the Mid lower Jurassic Coal Seam in Korjay Sunken,Turpan Hami Basin

In order to reveal the different mining area coal forming conditions in Korjay Sunken,Turpan Hami Basin,discusses the the relationship between coal quality and coal forming environment.Based on the data analysis of industrial analysis,harmful components and ash component index of main coal seam samples.On the basis of the analysis of the basic geological conditions such as the distribution of stratum and the characteristics of coal bearing rock series,the theories and methods of coal geology,coal petrology and coal chemistry are applied.The characteristics of coal seam and coal quality are summarized systematically,and the relationship between coal quality and coal forming environment is discussed.The results show that the study area is divided into 6 major mining areas from west to east.The coal seam is mainly developed in the Xishanyao Formation (J2x) of middle Jurassic and Badaowan Formation (J1b) of lower Jurassic.Coal quality is characterized by low ash,low sulfur,high volatile content,coal ash composition is mainly SiO2,Al2O3.Comprehensive analysis shows that the main coal seams of the Middle Lower Jurassic are formed in lake river delta freshwater sedimentary environment of coal formation in terrestrial facies,and also the coal forming environment are warm and humid.