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依据华北地台晚古生代陆表海沉积建造层序界面的识别标志,在红阳煤田石炭—二叠系残余地层中识别出了6个层序界面,并据此建立了由DS1-DS55个三级层序构成的层序地层格架,揭示了红阳煤田石炭—二叠纪沉积环境由海相到陆相演化的过程。DS1-DS5层序地层岩性岩相分析表明:DS2、DS3层序是石炭—二叠纪主要聚煤期。DS2层序发育堡岛体系,岛后泥炭坪与滨岸沼泽相沉积在区内形成了厚度较大且连续性较好的12、13煤;DS3层序发育三角洲体系,泛滥盆地与分流间湾相沉积发育了多层不可采或局部可采煤层。与DS3层序海陆过渡相沉积成煤相比,DS2层序海相沉积煤层的灰分与硫分相对较高,且在区域上都呈现由北向南逐渐升高的趋势,这与海水退出红阳煤田的方向相吻合,表明红阳煤田石炭—二叠纪聚煤期古地理格局对煤层发育及煤质特征具有明显的控制作用。
Based on the identification of sequence interfaces of the Late Paleozoic land surface sea-surface sediments in North China Platform, six sequence boundaries were identified in the Carboniferous-Permian remnant strata in Hongyang coalfield. Based on these results, DS1-DS55 third-level strata Sequence stratigraphic framework reveals the evolution of the Carboniferous-Permian sedimentary environment in Hongyang coalfield from marine phase to continental phase. The lithology and lithofacies analysis of DS1-DS5 sequence stratigraphy shows that the DS2 and DS3 sequences are the main Permian-Permian coal-forming period. The DS2 sequence developed the island system, and the peat floor and the shore swamp deposition in the island formed thick and continuous 12 and 13 coal in the area. The DS3 sequence developed delta system, flooding basin and shunt bay Sedimentary development of multi-layer can not be mining or partial recoverable seam. Compared with DS3 stratigraphic sedimentary coal, the ash and sulfur content of the DS2 sequence marine sedimentary coal seam are relatively high, and are gradually increasing from north to south in the region, The direction of the coalfield coincides, indicating that the paleogeographic pattern of the Permo-Permian coal-accumulation period in the Hongyang coalfield has significant control over the coal seam development and coal quality.