关键词: 煤层厚度变化, 澙湖相, 沉积环境, 潮坪相, 浅海相

Abstract: Kailuan mining area is the main coal production base in Hebei Province. The coal-bearing strata of Carboniferous Permian formation are abundant in the mining area. In order to explore the occurrence characteristics of No.14 coal in Kailuan mining area, this paper analyzed the original sedimentary environment and coal seam occurrence characteristics of Kailuan mining area by statistical analysis of seeing No.14 coal boreholes in Kailuan mining area, using sedimentary stratigraphy, coalfield geology and coal petrology. It is concluded that the occurrence characteristics of No.14 coal are mainly influenced by the original sedimentary environment. In the early stage, the main sedimentary environment is the Lagoon facies. Because of the existence of subaqueous bar, the hydrodynamic force in the Lagoon is weak, and peat is deposited earlier on the land side of the sand bars. Due to the continuous advance of land to the sea, the study area gradually transited to tidal flat facies and exposed to the surface, which resulted in extensive sedimentary peat in the study area. Later, the peat accumulation was stopped due to the transition from transgression to shallow sea facies.