Abstract: Xiaohelong gas field is a new natural gas production basement which was developed last year in Jilin oilfield.The main productive formation are both the first and the third member in Quantou group.Though their sediment environ- ment are same and belong to river faces,there are some ob- vious differences between them by analyzing of dynamic and stationary materials.After apprehensive research,the paper made detailed geological analysis between both of the reser- voirs.Therefore,it could provide some beneficial reference about the evaluation of compacted and water-bearing gas reservoirs.