中文摘要：

结合野外地质调查等工作,运用沉积学、层序地层学及煤田地质学的基本理论和方法,共识别包括区域不整合面、河流下切谷等4个层序界面,将云南富源一带晚二叠世含煤岩系—宣威组划分为3个三级层序。云南富源一带晚二叠世成煤过程中,在河流冲积平原靠陆一侧,在最大海泛面附近,泥炭堆积速率和海平面上升速率持平,沉积环境的相对稳定和沉积时间的持续累积,形成厚煤层。海侵体系域成煤最好,高位体系域也是煤层形成期,低位体系域最不利于成煤。

英文摘要：

Using data from cores and outcrops combined with field geological survey,the basic theories and methods of sedimentology,sequence stratigraphy and coalfield geology are employed to identify a total of 4 sequence boundaries which are characterized by incised valley filled coarse-grained sandstone at disconformities.These sequence boundaries divide the Late Permian coal measures-Xuanwei Formation in Fuyuan area,Yunnan province,into 3 third-order sequences.During the course of the coal seam accumulation in the Late Permian in Fuyuan area,near the land part of the meandering alluvial plain and the maximum flooding surface,where the peat accumulation rates are almost the same as the accommodation creation rates resulting from the rise of sea level,a stable sedimentary condition and long-time deposit are maintained and thick coal seams are formed.The thick coal seams tended to accumulate at the Transgressive System Tract,the coal seams could also be formed at the High System Tract,whereas,the sedimentary environments are difficult for coal accumulation at the Lowe System Tract.