Submarine or sub-lacustrine lobe deposits are important reservoirs, but the fan fringe deposits form heterogeneities within deep water fan deposits. Fan fringe facies records the complex sediment gravity flow types. By understanding of the bed types and flow mechanisms, we can identify the fan fringe deposit, which aids in the reconstruction of deep water fan and reservoir evaluations. The Jiucaiyuanzi and Dalongkou sections in the West Bogda Mountains preserve well-exposed 536-m and 171-m thick successions, respectively, of a deep water lacustrine depositional system from the Middle Permian Lucaogou Formation. Bed types of the Lucaogou Formation include high-density turbidite, low-density turbidite, incomplete Bouma-type turbidite, hybrid event beds, and slump deposits. The Lucaogou Formation is interpreted here as a fan fringe facies due to the thin bed thickness that characterize turbidites and hybrid event beds, as well as the predominance of the isolated sheet architecture. Previous studies suggest that these deposits were considered as deposited in a deep water setting due to the absence of wave-related structures. The presence of abundant mud clasts in massive medium-coarse grained sandstone beds reflects the significant erosional capability and interactions between high-density turbidity currents and lake floor. The fan fringe facies here contains amalgamated and thick-bedded homolithic facies (~ 30%) and thin-bedded heterolithic facies (~ 70%). The examination of the bed type is of wider significance for facies prediction and reservoir heterogeneity in the sub-lacustrine fan fringe facies.

海底或湖底的叶状沉积物是重要的储层，但扇形边缘沉积物在深水扇形沉积物中形成非均质性。扇状边缘相记录了复杂的沉积物重力流类型。通过了解床的类型和流动机理，我们可以确定扇状边缘沉积物，这有助于重建深水扇和储层评估。西博格达山的九彩园子断层和大龙口断层分别保留了中二叠系芦草沟组深水湖沉积系统的536-m和171-m厚的连续演替。芦草沟组的床层类型包括高密度浊度，低密度浊度，不完全布马型浊度，混合事件床和坍落沉积物。卢考沟组在这里被解释为扇状边缘相，这是由于薄的层厚（代表浊度和杂化事件层）以及孤立的片状构造的优势。先前的研究表明，由于没有波浪相关结构，这些沉积物被认为是在深水环境中沉积的。大量的中粗粒砂岩床中存在大量泥屑，这反映了其显着的侵蚀能力以及高密度浊流与湖床之间的相互作用。此处的扇形边缘相包含混合的厚层均质相（〜30％）和薄层异质相（〜70％）。床型的研究对于湖底扇缘相的相预测和储层非均质性具有更广泛的意义。