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通过对鄂尔多斯盆地东北部延安组第二单元顶部煤层进行宏观煤岩描述、显微组分鉴定,分析了该煤层煤质特征:该煤层宏观煤岩类型以半暗型和暗淡型煤为主;显微煤岩类型以以镜质组和惰质组为主,含量均在40-60%。在此基础上,通过煤相分析结果显示,该煤层沉积环境介于低位和高位之间的赋水较浅森林木本沼泽,不受强水流带来的碎屑物沉积物影响,成煤堆积方式为原地堆积,植物以木本为主,草本植物次之。
Through the macroscopic coal and rock description and microscopic composition identification of the top coal seam of the second unit of the Yan’an Formation in the northeastern Ordos Basin, the coal quality characteristics of the coal seam are analyzed. The macroscopic coal and rock types of the coal seam are dominated by semi-dark and dark coal; The types of micro coal and rock are dominated by vitrinite and inertinite with the content of 40-60%. On this basis, the results of coal phase analysis show that the sedimentary environment of the coal seam is between the low and high water rich woody swamps, and is not affected by the debris sediment brought by the strong water flow. The coal accumulation Way for the accumulation of native plants mainly of woody, followed by herbs.