宁阳煤田茅庄井田煤系地层特征和成煤环境分析

Analysis on Characteristics and Coal-bearing Environmental of Coal-bearing Strata in Maozhuang Coal Well in Ningyang Coal Mine

通过对宁阳煤田茅庄井田煤系地层综合分析,揭示了茅庄井田的煤层岩性特征和沉积环境。研究结果表明:该井田主要含煤地层为早二叠世山西组和晚石炭世—早二叠世太原组,总厚度约220 m。可采或局部可采者4层,即3上煤层,3下煤层,16煤层、17煤层,平均总厚度为9.52 m。本井田内3上煤层、3下煤层为主采煤层。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。沉积环境为从海相沉积为主到以陆相沉积为主的转变过渡时期,岩石地层反映了典型的海陆交互相的沉积特征;在海陆交互期海退三角洲平原上供应了大量的泥炭沼泽,为茅庄井田煤层提供了物质基础。其中太原组为典型的海陆交互相沉积,沉积相环境稳定,变化小,标志层及煤层层位清楚、稳定,煤层沉积层序规律性强,是区域地层对比的稳定层位。

Through comprehensive analysis on coal-bearing strata in Maozhuang coal well in Ningyang coal mine,lithology characteristics and coal-bearing environment of this coal deposit has been revealed.As showed by the results,major coal-bearing strata in this area is the lower Permian Shanxi formation and the upper Carboniferous Taiyuan formation.The total thickness is about 220m.Recoverable or partially recoverable coal layers are upper part of the third coal layer,lower part of the third coal layer,sixteenth layer and serventeenth coal layer.The average thickness is 9.52m.Among these layers,the upper part of the third coal layer,the lower part of the third coal layer are major mining layers.Coal-bearing layers are Carbonierous-Permian Yuemengou group,while Shanxi formation is the most important coal-bearing strata in this area.Depositional environment is the transition period from marine facies to continental sedimentary facies.Rock strata reflect the typical characteristics of Interactive deposition between land and sea.Peat swamp in the delta plain formed by sea regression supplied the material foundation for coal strata of Maozhuang coal well.Among them,Taiyuan formation is a typical marine facies sedimentary with stable environmental,small changes in marker bed and clear and stable coal layer,regular position and coal sedimentary sequence.It is stable regional stratigraphic correlation layers.