Abstract:

Natural sas in the northwest margin of Junggar Basin could be classified into oiltype gas,mixed gas and coal-formed gas according to its genesis,and could also be divided based on the storing forms into dissolved gas, gas-cap gas and condensate gas. The distribution of different genetic gases may coincide with that of the source rocks:oil-type gasis mainly distributed in oil-bearing strata from Carboniferous to Jurassic in the main bidyo f the hangins wall of Karamay-Wurehe fault; coal formed gas is predominantly distributed in the Upper Permian Wuerhe Formation and Lower Permian Jiamuhe Formation of Ke-75 wellblock in the south of No.5 district; mixed gas primarily preserved in the Up-Per Permian Wuerhe Formation of 546 wellblock in No.8 district.