重庆磨心坡龙潭组沉积环境与聚煤规律研究

摘要

Based on the field geological investigation and drilling core,detailedly observes on the characters of the lithology,biological fossils and sedimentary structures of the upper Permian Longtan Formation in Moxinpo exploration area,and investigates the depositional environment and coal-accumulating patterns with the theory of sedimentary environment analysis and coal-accumulating laws.The Longtan Formation coal-forming swamp directly developed on tidal flat.The mining coal seam has a little thickness but with a stable stratum,broadly developed,easily compared,which mostly is high-ash and medium-high sulpher in this area.During the late Permian,the Formation experienced 10 times of transgression and 11 times of regression,alternately developing lagoon,tidal flat and platform,mainly are marine-terrigenous facies coal-accumulating buildup,which belong to localized carbonate peat tidal flat-platform coal-accumulating environment.The research result provides the theoretical support to prospecting direction for the exploration of replacement resources in this coal mine.%通过野外地质调查及钻探取芯的方法,详细地观察磨心坡勘查区上二叠统龙潭组的岩性、生物化石及沉积构造特征,并应用沉积环境分析与聚煤规律的理论,研究该区的沉积环境和聚煤规律.本区龙潭组成煤沼泽直接发育在潮坪上,煤层厚度不大,但层位稳定,且分布广,易于对比,可采煤层多为高灰、中高-高硫煤.研究表明,该区共经历了10次海侵和11次海退沉积,泻湖-潮坪-台地环境交替出现,主要系海陆交互相含煤构造,属局限海碳酸盐岩台地泥炭坪聚煤环境.研究成果可为磨心坡煤矿开展接替资源勘查提供理论依据和找矿方向.