Abstract: Carboniferous strata of the east Junggar area can be divided into four formations：Tamugang Formation，Dishuiquan Formation，Batamayineishan Formation and Shiqiantan Formation.Source rocks are developed in all of the four formations.Distribution of the Tamugang Formation and Shiqiantan Formation are relatively limited，and their exploration degree are low，and so it is difficult to evaluate them accurately.However，the Dishuiquan Formation is a set of important source rocks with the advantages of big thickness，stable distribution，abundant organic materials，good organic types，and high hydrocarbon generation intensity.Similar to the Dishuiquan Formation，the Batamayineishan Formation of the upper Carboniferous is also extensively distributed and has a good hydrocarbon generation index，and it has entered the high hydrocarbon generation stage.Thus it is a set of important source rocks for the Beisantai and Jimusaer area of the southern east Junggar Basin.Oil and gas fields which have good correlations with the two sets source tocks are discovered in Wucaiwan and Beisantai，indicating a well exploration prospect in Carboniferous.

Key words: East Junggar, Carboniferous, source rocks, Dishuiquan Formation, Batamayineishan Formation