单县煤田张集井田地质特征与成煤环境分析

区域性张性断裂把鲁西地区分割成凸起、凹陷相间排列的构造格局,控制着该区含煤地层及煤炭资源的分布。山东省单县煤田张集井田位于青崮集凸起（潜）北侧,单县断层以南,含煤地层盖层为第四系、新近系和古近系,厚度约500～700 m,沉积基底为奥陶系,含煤地层为石炭-二叠纪月门沟群,其中山西组是该区最重要的含煤地层。石炭-二叠纪是海相到陆相的过渡时期,在古气候、古环境和古构造的共同作用下,形成了煤层;同时,该区所处的特殊构造位置为煤层的保存提供了有利条件。

Analysis on Geological Characteristics and Coal-Forming Environment of Zhangji Mine Field of Shanxian Coal Mine

Located in the east of Shanxian county,Shandong province,Zhangji mine field＇s tectonic framework is composed of swells and sags distributing one by one separated by regional extension fractures,which controls the distribution of strata as well as its coal resources.The existing strata in this area include Quaternary System,Neogene System,Paleogene System,Carboniferous-Permian System,Ordovician System,Cambrian System and Precambrian System.The thickness of unconsolidated rocks of Quaternary System and Neogene System are about 500 meters.The main coal-bearing stratum of Zhangji mine field is Shanxi Formation which belongs to Yuemengou Group of Carboniferous-Permian System.During the periods from Carboniferous to Permian,the regression made this area an extensive delta plain with peat mire,and the flouring of Cathysia flora supplied abundance of materials for the accumulation of peat.