THE COAL FACIES PROPERTIES OF MEGA COAL SEAM IN XIAOLONGTAN FROMATION IN XIANFENG BASIN
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摘要: 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。Abstract: Based on the observations and quantitative analyses of macerals in 29 coal samples,combining with the analysis of chloroform bitumen "A" group component and gas chromatographical analysis of saturated hydrocarbon,the coal facies properties of mega coal seam in Neogene Miocene Xiaolongtan Formation(N1x) in Xianfeng Basin are studied.It is indicated that the peat swamp underwent a larger variation of water depth from shallower to deeper and then from deeper to shallower during the formation period of this mega coal seam,totally,the swamp belonged to the low lying one.This mega coal seam had a mixing biological source in which the higher terrestrial plant was the dominant one and the higher aquatic plant was the subsidiary one.Due to the favorable meteorological and hydrological conditions,better accumulating situation and abundant coal-forming original material in the intermont basin,the mega coal seam was formed finally in the stably subsided peat swamp setting in early period of Miocene.
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Keywords:
- mega coal seam /
- coal facies properties /
- Xiaolongtan Formation /
- Xianfeng Basin
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