Bachu arch,one of hydrocarbon abundance units in Tarim basin,has experienced a series of rise and denudation as well as drop and sedimentation since Ordovician period.

• 巴楚凸起是塔里木盆地油气富集单元之一,自奥陶纪以来经历了多次隆升剥蚀与下降沉积的交替过程,经喜马拉雅运动期的断裂褶皱、抬升剥蚀,定型为塔西南前陆盆地的前缘隆起。