通过层序地层学研究, 将川东北地区下三叠统飞仙关组划分2 个三级层序( SQ1 和SQ2) , 8个体系域, 分析了飞仙关组三级层序的岩相古地理特征和演化。研究表明: SQ1 层序时期, 川东北地区受晚二叠世长兴末期的区域构造抬升影响, 一度开宽水深的台盆水体逐渐变浅而转化为开阔台地相沉积环境, 其中台地边缘和台内的鲕滩相极为发育, 是形成整个飞仙关组鲕滩的主要时期,其中尤以海侵期的鲕滩最为发育; SQ2 层序时期, 由于受极度干旱炎热的气候影响, 海平面下降和水循环受限及台地暴露, 川东北地区鲕滩消减, 进入局限和蒸发台地沉积环境, 最后沉积地貌基本被填平。

Based on the study of sequence stratigraphy, Feixianguan Formation is divided into two third-order sequences ( SQ1, SQ2) and eight system tracts, of which the lithofacies and paleogeography are analyzed. During the first deposition of the third-order sequence cycles ( SQ1) , influenced by the regional tectonic uplifting in Changxing stage of Late Permian in northeastern Sichuan, the seawater once deep and wide became shallow, and the depositional evolution changed from basin facies to open-platform facies, of which oolite beach developed well. During the second deposition of the third-order sequence cycles ( SQ2) , due to arid and hotter climate, fallen sea level, limited water cycle and exposed carbonate platform, the depositional evolution became to restricted platform and evaporated platform facies, and the oolite beach in northeastern Sichuan decreased. Finally, the sedimentary geomorphology was nearly full filled.