准东煤田五彩湾矿区西山窑组巨厚煤层煤相研究

新疆准东煤田五彩湾矿区西山窑组煤层厚度稳定,分布广泛,煤质优良.笔者从成因角度运用煤田地质学、煤岩学、煤地球化学及沉积学等,进一步探讨西山窑组巨厚煤层煤岩组分特征、煤相类型.结果表明,煤层微观煤岩以镜质组为主,惰性组次之,含少量壳质组.相学分析表明,该区聚煤沼泽类型以湿地森林沼泽相为主,干燥森林沼泽相次之.少数样品指示成煤过程中短时期、周期性深覆水或开阔水域沼泽相存在.煤相分析显示威煤环境具网状河三角洲沼泽相沉积特征.煤岩和煤相分析为聚煤环境分析、煤质评价和预测、煤的可选性评价等提供科学依据.

The Coal Facies Research on the Xishanyan Formation in the Wucaiwan Coalfield Eastern Junggar Basin,xinjaing

The Wucaiwan coalfield,which contained the heavy coal seams in the Xishanyao formation in Jurassic,was located in the western part of the Eastern Junggar basin,Xinjiang,and the thick coal-seam was successively and steadily distributed with high coal quality,which was the main explore object.so the author apply the theory knowledge and method include of coal geology,coal petrology,coal geochemistry and deposition etc.further approach the Xishanyao formation thick coal seams’s petrology composition and coal facies,and the result indicated: Macerals of the coal seams was dominantly made up of Vitrinite(mainly telinite,detrovitrinite and corpovitrinite) and secondarily Inertinite(fusinite and semifusinite),with little liptinite.Coal facies study showed the coal was mainly formed in the wet forest swamp and secondarily in the dry forest swamp.Few studied samples indicated shorted and periodic the overlying water forest swamp and the open water swamp depositon during the coal-accumulating stages.The analysis of the coal petrology and coalfacies interpreted the characteristic of coalforming environment was the braided channel delta.which also had provided some basis for the analysis of coalforming environment,assessment and the coal quality and the preparability.