鄂尔多斯盆地早二叠世聚煤环境与成煤模式分析

The Analysis of Coal Accumulating Environment and Coal Forming Models in Early Permian,Ordos Basin

通过分析鄂尔多斯盆地早二叠世煤层分布规律、沉积相及古地理、聚煤环境类型及时空分布,认为主要的聚煤沉积体系为障壁海岸、潮控三角洲及河流(三角洲平原),其中陆相泥炭沼泽及海相泥炭坪是主要的成煤环境。障壁海岸聚煤模式、潮控三角洲成煤模式、河流(或三角洲平原)成煤模式是区内存在的3种主要成煤模式,形成了主要的可采煤层。对煤层形成和保存的根本控制因素是与泥炭沉积相关的可容纳空间的变化速率。

The analysis of the distribution trait of the coal seam, sedimentary facies and paleogeography, environment types of coal accumulating and the temporal and spatial distribution in the Early Permian of Ordos Basin shows that the main coal accumulating sedimentary systems are beach-barrier, tidal delta and fluvial or delta plain, and the continental mire marshes and the marine peat flat are the main coal-bearing environment. The three main coal-bearing systems are the beach-barrier coal acoumulating system, the tidal delta coal-bearing system and the fluvial or delta plain coalbearing system, which formed the main economic coal-bed. The controlling factor of the formation and protection to the coal-bed is the accommodation space variation rate which is relevant to the peat sediment.