平顶山矿区二_1煤层煤相分析

COAL FACIES ANALYSIS IN THE COAL B_1 PINGDINGSHAN MINING AREA, HENAN

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 association, peat swamp types and its formation conditions of coal seam B_1 in Pingdingshan mining area are studied by way of the coal petrology and coal chemistry. Two coal facies are distinguished: reduction facies and oxydation facies. Both have qualitative and quantitative index. Coal B_1 is composed of three or four succession from reduction facies to oxydation facies, showing the development from forest swamp to marsh upwards. This succession probably represents the seam formed in flat coastal plain environment. It was autochthonouslly partly hypautochthonousely deposited in raised swamp under ombrogenous, oligotrophic conditions B_1 was formated in freshwater peat swamp, but the top of the seam show brackish influences.