Preservation conditions for formation water and hydrocarbon in Wuxia area, Junggar Basin

Based on the complicated distribution of geological fluid in Wuxia area of the Junggar Basin,from the aspects of hydrogeological conditions and formation water chemical characteristics,it has been discussed in this paper the relationship between formation water and hydrocarbon preservation.Studies have suggested that,Permian and Triassic experienced short stages of atmospheric water seepage and long stages of water compression since they were in alternative blocking and stopping belts.Severely influenced by deep thermal fluids,the formation water was mainly CaCl₂ and NaHCO₃ types with high salinity as well as low sodium chloride and de-sulfate coefficients.It was not or seldom damaged and provided excellent conditions for the preservation of hydrocarbon.