Yili basin is a residual basin developed in the western Tianshan Mountains folded belt.It was developed on the early Paleozoic broken basement and went through several stages of tectonic movements.

• 摘要伊犁盆地是西天山褶皱带中一个构造残留盆地，纵向上发育二叠系、侏罗系两套烃源层系，形成上、下两套油气系统。