Abstract: Coal seams in Jurassic Xishanyao and Badaowan Formation were developed well in the Baijiahai dome of Junggar Basin. The burial depth of main coalbed is more than 1 500 m. Over the past ten years,the pre-production of several conventional oil and gas wells in coal seams had obtained good results,the volume of coalbed methane were more than 7 000 m3 ,which shows a good deep coalbed methane exploration prospect in Baijiahai dome. The amount of coalbed methane resources remains to be developed in Cainan oilfield. Based on the in-depth analysis of deep coalbed distribution characteristics,coal thermal evolution degree,the distribution of gas content and adjacent formation,it is considered that the Xishanyao coalbed is an independent CBM-bearing system,and the combination of Badaowan coal- bed and its adjacent sandstone is another CBM-bearing system. The superior accumulation conditions of the inner- source type and outside source type of Badaowan CBM-bearing system are enriched in CBM and sandstone gas re- sources,both two have a potential in commingled production.