1．Shaanxi Coal Geoloy Exploration Institute Co．，Ltd．，Xi’an 710021，China; 2．Shaanxi Energy Group Ｒesearch Institute，Xi’an ，China

基于吐哈盆地煤层厚度变化大煤层对比困难的实际,为了找出新的可以用于煤层对比的明显差异性特征,采用煤岩学的方法,对吐哈盆地三道岭剖面煤层煤相进行了分析研究。结果表明:三道岭剖面西山窑组煤层成因参数镜惰比较高,组织保存指数和植被指数较低,凝胶化指数均大于1。煤相类型为潮湿的草木混生型泥炭沼泽,包括3种亚相:RMⅠ型、RMⅡ型、RMⅢ型。其中RMⅡ型煤相具有凝胶化指数和镜惰比特别高,地下水流动指数最低的特征。煤层自下而上水动力条件出现减弱-增强-减弱的变化,煤层覆水深度由深到浅变化;RMⅡ型煤相特征明显,可以用于吐哈盆地煤层对比。

Based on the actual comparison difficulty of the high thickness variation in Turpan－Hami Basin，in order to seek the obvious the new different characteristics applied to compare the seams，a coal petrology method was applied to the analysis study on the coal facies of the seam in Sandaoling Section of Turpan－Hami Basin．The study results showed that the genetic parameters of the seam in Xishanyao For- mation of Sandaoling Section were high in the vitrinertite ratio．The tissue preservation index and the vegetation index were low．The gelifica- tion index was all higher than 1．The coal facies type was a wet vegetation type mixed peat swamp，including three subclasses of the peat swamp I type，the peat swamp II and the peat swamp III type．Among them，the peat swamp II type coal facies would have very high gelifi- cation index and vitrinertite ratio and the underground water flow index would have the lowest features．The hydrodynamic condition from the top to bottom of the seam would have the variation from weak－enhancement－weak and the water covering depth of the seam would be changed from the deep to shallow．The coal facies features of the peat swamp II was obvious and could be applied to the comparison of the seams in Turpan－Hami Basin．