滇东北晚二叠世沉积体系与层序地层格架下的聚煤特征

利用地层剖面岩相组合、沉积构造序列、生物化石标志等分析了研究区晚二叠世沉积体系与其空间配置格局及演化。在此基础上，通过对不同古地理背景下层序界面及体系域界面的识别，建立了研究区晚二叠世的层序地层格架。总结了煤层层位的空间叠置关系及其形成机制，初步分析了煤中硫的分布规律，讨论了研究区厚煤层（C5）在层序格架下的聚煤特征和位置。结合最新的勘探资料，预测出研究区中西部盐津—彝良一带蕴藏着资源潜力巨大的优质煤。建议今后在保持东部威信—镇雄一带勘探开发力度的同时，注意加大对预测靶区煤田的地质勘探投入。

Research on coal-accumulation features in Late Permian sedimentary system and sequence stratigraphic framework, Northeastern Yunnan, China

The authors analyze Late Permian sedimentary system and its spatial distribution and evolution in study area based on the lithofacies associations, sequence of sedimentary structure and biological fossils of the stratigraphic sections. On the basis of results above, Late Permian sequence stratigraphic framework is established according to identifying sequence and system tract interface under different paleogeographical backgrounds. The authors summarize spatial superimposed position and formation mechanism of coal seams and sulfur distribution features in coal seams. In addition, they discuss coal-accumulating features and locations about the thick coal seam (C5) under the framework of sequence stratigraphy. Combining with latest exploration data, the authors predict that there are enormous potential resources of high-quality coal on Yanjin-Yiliang region in midwest of study area, and they emphasize increasing the coal-geological exploration investment on predicted target areas at the same time of keeping exploration and development on coal resources Weixin-Zhenxiong region in east of study area.