Abstract
Crude oils of different ages (J,E-N,and N)from Qaidam basin can be divided into three types according to the patterns of distribution of hydrocarbons on chromatogram.Among them.the maturity of crude oil J is higher.The main peak carbon of normal pararffins is C,and the pristane to phytane ratio is 2.44—2.90.Crude oils E-N are characterized by higher Phytane peak than other.The pristane/phytane ratio 0.86—0.52,and the main peak carbonof normal paraffins commonly is C.It is obvious that even carbons play a dominant role on chromatogram of normal paraffins.For crude oil N,the light components take a prevailing place.The main peak carbon of normal paraffins is C,while the pristane/phytane ratio is 1.26.In N and N,there are some crude oils formed by degradation,in which the action of microbes is of prime importance.Neady all normal paraffins are degraded by microbes,therefore,the isoprenoids are the foremost on the whole hydrocarbon chromatogram.Questions of migration of crude oils are also tentatively discussed here.
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