Abstract: In order to guarantee the stable gas supply in the north Xinjiang and the West?East natural gas transmission project’s secondline strategy security, PetroChina Xinjiang Oilfield Company selected Hutubi gas field to rebuild underground gas storage. Based on the new drilling and coring data as well as well logs, this paper analyzes the reservoir properties such as rock mineral composition and petrophysical property variation, and the reservoir is divided into 4 types: high quality reservoir, secondary reservoir, poor reservoir and poornon reservoir. The E1-2z1-1 2 reservoir belongs to the secondary reservoir through in?depth understanding of the gas storage, which provides a basis for the underground gas storage steady running and gradual expansion in the future