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应用煤岩学和煤化学方法,对平顶山矿区二_1煤层的煤相组成、泥炭沼泽类型及其形成条件进行了探讨。将煤相划分为还原相和氧化相。它们具有相应的定性和定量指标。二_1煤层由3～4个周期性相序构成,反映了成煤沼泽由森林沼泽向草本或草本木本混生沼泽的演化过程。这种相序可能代表一种滨海平原环境下的聚煤特征。二_1煤属贫营养的雨成凸起沼泽,基本上为原地堆积成煤。二_1煤层形成于淡水泥炭沼泽,但其顶部曾受过半咸水环境影响。
The coal facies composition, peat swamp type and formation conditions of No.2_1 coal seam in Pingdingshan Mining Area were studied by using coal petrology and coal chemical method. The coal phase is divided into the reduction phase and the oxidation phase. They have corresponding qualitative and quantitative indicators. The second-1 coal seam is composed of 3 ~ 4 periodic facies, which reflects the evolution of coal marsh from forest swamp to herbivorous or herbivore mixed swamp. This phase sequence may represent a poly-coal feature in a coastal plains environment. Two _1 coal is poor nutrition rain convex swamp, basically in situ accumulation of coal. The II-1 coal seam was formed in a freshwater peat swamp but its top had been affected by the brackish water environment.