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塔里木盆地东南部中石炭统-下二叠统是一个顶底为Ⅰ类不整合所限定的二级沉积层序。该层序沉积期,塔里木盆地东南部存在三个古陆,两个浅海海峡,一个半深海斜坡。随着海平面上升-静止-下降于不同部位形成了不同沉积体系及组合。海进体系域由中上石炭统的滨岸破坏性三角洲和开阔台地碳酸盐岩体系组成,内部又存在三个三级海面升降周期,高位体系域由下二叠统的滨浅海-三角洲-河流体系组成,内部伴随多次三级海面振荡及其由此引起的沉积特征的变化。
The Middle Carboniferous-Lower Permian in the southeastern Tarim Basin is a second-order sedimentary sequence defined by the unconformity of top-Ⅰ type. During the sedimentary period of the sequence, there are three ancient landforms, two shallow sea straits and one and a half deep sea slopes in the southeastern Tarim Basin. With the sea level rise - still - descent in different parts of the formation of different sedimentary systems and combinations. The marine system tract consists of middle-upper Carboniferous coastal devastating delta and open platform carbonate rock system. There are three third-level sea surface lift cycles in the interior. The upper system tract consists of the Lower Permian coastal shallow sea delta- The river system is composed of several tertiary sea-level oscillations and the consequent changes in sedimentary characteristics.