据前人对准噶尔盆地东南部二叠纪—中生代陆相沉积的研究,仓房沟群地层划分为上、下两个亚群。依据岩性细分为泉子街组(P_2q)、梧桐沟组(P_2w)、韭菜园组(T_1j)和烧房沟组(T_1s)。泉子街组是一个由冲积扇演化到湖泊环境的沉积地层,代表了博格达山脉前渊南部边缘断块上升之后的坡脚冲积扇沉积物。随着气候湿度的增加,湖泊、沼泽环境占据了泉子街组沉积的晚期。潮湿气候在梧桐沟期进一步发育。由于源区盛行的化学风化作用,大量的粘土物质有利于形成粘土塞,另外繁盛的植物也稳固了河岸。伴随间歇性急浪冲刷的相对稳定的曲流带形成了梧桐沟组的旋回性沉积。韭菜园组基底构造相对较稳定,物源区进一步的夷平和后退,粗段沉积物变细,气候变得半干旱。一方面,半干旱气候决定的长期干燥间隔和短期不稳定的洪水作用,以及植物的大量减少,降低了河岸的稳定性,有利于发育低弯度河道;另一方面,伴有短期洪水的长期的干旱 According to previous studies on the Permian-Mesozoic continental deposition in the southeastern Junggar basin, the strata of Cangfanggou Group are divided into upper and lower subgroups. According to the lithology, it was subdivided into Quanzijie Formation (P_2q), Wutonggou Formation (P_2w), Leekyuan Formation (T_1j) and Tengfanggou Formation (T_1s). The Quanzijie Formation is a sedimentary formation evolved from an alluvial fan to a lake environment and represents the alluvial fan sediments after the southern margin of the Bogda Mountains rises. With the increase of climate humidity, lakes and marsh environments occupy the late deposition of the Quanzijie Formation. Moist climate in Wutong ditch further development. Due to the chemical weathering prevailing in the source area, a large amount of clay material favors the formation of clay plugs, and the thriving plants also stabilize the banks. The relatively stable meandering zone accompanied by intermittent flash floods formed the cyclonic deposition of Wutonggou Formation. The basement structure of Chiveyuan Formation is relatively stable, and the source area is further leveled and retreated. The thick sediments are thinned and the climate becomes semi-arid. On the one hand, long-term drying intervals and short-term unstable floods determined by semi-arid climate, as well as large-scale reduction of plants, reduce river bank stability and facilitate the development of low-caverns; on the other hand, long-term drought