四川省达竹矿区晚二叠世层序地层及岩相古地理

文章对四川省达竹矿区晚二叠世层序地层及岩相古地理进行了研究,厘定了该区层序地层格架,划分了2个三级层序;梳理了达竹矿区晚二叠世岩相古地理演化过程,总结出达竹矿区在层序Ⅰ沉积期发育碳酸盐台地、台地边缘、深水盆地岩相,煤层形成于低水位体系域期的泻湖-潮坪环境,在层序Ⅱ沉积期自南向北发育碳酸盐台地、台地边缘、深水盆地岩相,不发生聚煤作用。

This paper studies the Late Permian sequence stratigraphy and lithofacies paleogeography of Dazhu mining area in Sichuan Province,defines the sequence stratigraphic framework and divides two third-order sequences;traces the evolution process of lithofacies and paleogeography of Late Permian in Dazhu mining area,and concludes that carbonate platform,platform margin and deep-water basin facies are developed in Dazhu mining area during sequence I sedimentary period,and coal seams are formed in low waterin the lagoon tidal flat environment of potential system tracts,carbonate platform,platform margin and deep-water basin facies developed from south to north in sequence II sedimentary period,without coal accumulation.