A geochemical test on mixed sources of crude oils was made.Oil samples used werePermian oil from Bei-4 well in Bei Santai area

East Junggar Basin and Jurassic oilcollected from Mu-3 well in Fukang Depression.The result shows that the crude oil fromBei-27 well on the southwest slope of Bei Santai area is similar to the mixed crude oils of20:80(20 parts of crude oil from Bei-4 well:80 parts of crude oil from Mu-3 well)

andJurassic oil sources were the major contributor;the crude oil from Tai-22 well on twosides of Santai Uplift is similar to the crude oils of 50:50

and Permian and Jurassic oilsources were both the contributors.