The reservoir in middle and upper part of qiketai formation is mainly composed of lithic sandstone , which is the first lithologic section 七克臺組中上部儲集層以巖屑砂巖為主,屬于第一巖性段。
The reservoir from the lower part of qiketai formation to xishanyao formation is mainly composed of feldspathic litharenite , which is the second lithologic section 七克臺組下部-西山窯組儲集層以長石巖屑砂巖為主,屬于第二巖性段。