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通过２９个煤样的显微组分观察和定量分析，结合氯仿沥青“Ａ”族组分分析和饱和烃气相色谱分析，对先锋盆地上第三系中新统小龙潭组（Ｎ１ｘ）巨厚煤层的煤相特征进行了研究。结果表明该厚煤层形成期间泥炭沼泽经历了一次大的由浅变深、又由深变浅的水深变化，总体上属于低位沼泽。该厚煤层具有以陆生高等植物为主、以水生高等植物为辅的混合生源，山间盆地优越的气候水文条件、良好的聚集场所和充足的成煤原始物质最终在中新世早期稳定下沉的泥炭沼泽环境中形成了巨厚煤层
Through the observation and quantitative analysis of the microscopic composition of 29 coal samples and the analysis of the “A” component of chloroform bitumen and the analysis of saturated hydrocarbon gas chromatography, the thickness of N1x in the Miocene of the Pliocene in the Pioneer Basin Coal seam characteristics of the coal were studied. The results show that during the formation of the thick coal seam, the peat swamp experienced a large change from shallow to deep and from deep to shallow water depth, and generally belongs to the lower marsh. The thick coal seam has mixed terrestrial plants, mainly aquatic plants, supplemented by aquatic plants. The favorable climatic and hydrological conditions of the mountain basin, good accumulation sites and sufficient coal-forming raw materials are eventually stabilized in the early stage of the Miocene Thick peat swamp environment formed thick coal seam