The petroleum was filled to the Permian System in the end of Jurassic and since Tertiary, which matched the traps formed in late Hercynian and Yansh.

• 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。