Abstract: The Daniudi gas field is located in the north of Yishan slope,E’erduosi basin.The mainly gas-bearing formation are Taiyuan formation(Carboniforous),Shanxi formation and lower Shihezi formation(Permin).The hydrocarbon source rocks in the field are Taiyuan formation and Shanxi formation,and they have three kinds of type:coal bed,dark mudstones and limestones.there are three suit of reservoir rock that are the barrier bar in Taiyuan,delta-plain distributary channel sandbodies in Shanxi and fluvial facies channel sandbodies in lower Shihezi.The reservoir are of the low porosity,low permeability tight sandstone.The regional cover of the field are the lake facies thick mudstones in upper Shihezi formation,and the local cover are mudstones in Taiyuan,Shanxi and lower Shihezi.They form the multi-cover system.The source-reservoir-seal assemblage include two types:the lower formation generate gas,the upper formation store gas,and gas generated and stored within the same formation.The field grow mainly the lithologic traps.All of the characteristics show that the Daniudi is a typical compound gas field.

Key words: E’erduosi basin, Daniudi, compound gas field, geological characteristics