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笔者按照光泽强度对延安组的煤划分为光亮型煤、半亮型煤、半暗型煤和暗淡型煤四个宏观煤岩类型。同时指出暗淡型煤从鄂尔多斯盆地边缘向其中部逐渐地减少,光亮型煤则增多。对其显微煤岩组分划分为五组:镜质组、半镜质组、半丝质组、丝质组和壳质组。对于鉴定出的新组分——焦化组分在文中另作描述.与宏观煤岩类型在盆地中的分布规律相吻合,半丝质组和丝质组从盆地的北部、西部和南部边缘向中部逐渐地降低。同是这个方向,镜质组则逐渐增高。煤岩组成在盆地中的分布规律与盆缘的深部高温挥发分的作用有关。与之相应的是煤化学特征的表现。煤的挥发分和发热量由盆地边缘向中部升高,而灰分产率则从盆地边缘向中部降低。
The author classifies the coal of the Yan’an Formation into four types of macroscopic coal rocks such as bright coal, semi-bright coal, semi-dark coal and dark coal in accordance with the gloss intensity. At the same time, it is pointed out that the dim coal gradually decreases from the edge of Ordos Basin to the middle of it, while the bright coal increases. The micro-coal and rock components are divided into five groups: vitrinite, semi-vitrinite, semi-silk, silk and chitin groups. For the identified new component - the coking component is described separately in the text, which is consistent with the distribution pattern of the macro-coal type in the basin. The semi-silk group and the siliceous group extend from the northern, western and southern margins of the basin Central gradually decreased. In the same direction, vitrinite gradually increased. The distribution of coal and rock composition in the basin is related to the role of deep high temperature volatiles in the basin margin. Corresponding to the performance of coal chemical characteristics. The volatile and calorific value of coal increased from the margin of the basin to the middle, while the ash yield decreased from the edge of the basin to the middle.