摘要
登封煤田白坪一带山西组地层发育较好,主要为一套过渡相含煤沉积,划分为泻湖、潮坪等42个微相.属泻潮——潮坪及滨海三角洲体系沉积,所含二_1煤层形成于总体海退与短暂海侵的泻湖海湾及潮坪亚环境,其煤厚变化规律主要受潮坪亚环镜所控制.
The Shanxi formation in the Baiping area within the Dengfeng coal field was devel- oped very well.It represents coal-bearing deposits dominated by transitional facies.Forty-two microfacies can be distinguished,belonging to two major depositional sys- tems,i.e.the littoral delta and the lagoon-tidal flat depositional systems.The coal seam Ⅱ_1 of the Shanxi formation was formed from the lagoon-gulf and the tidal flat subenvironments during the overall regression and the transgression.The variation in thick- ness of coal seam Ⅱ_1 is controlled essentially by the tidal flat subenvironment.
关键词
煤田
沉积体系
成煤
山西组
coal-bearing deposits
transitional facies
littoral delta depositional system
lagoon-tidal flat depositional system
coal seam II_1
tidal flat subenvironment
