Oil & Gas Geology ›› 1983, Vol. 4 ›› Issue (1): 121-127.doi: 10.11743/ogg19830111
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Wang Youxiao, Cheng Xuehui, Wu Yihua, Chuan Lanlan
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Abstract:
Crude oils of different ages (J2,E3-N21,and N22)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 J2 is higher.The main peak carbon of normal pararffins is C15,and the pristane to phytane ratio is 2.44—2.90.Crude oils E3-N21 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 C22.It is obvious that even carbons play a dominant role on chromatogram of normal paraffins.For crude oil N22,the light components take a prevailing place.The main peak carbon of normal paraffins is C13,while the pristane/phytane ratio is 1.26.In N1 and N21,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.
Wang Youxiao, Cheng Xuehui, Wu Yihua, Chuan Lanlan. GEOCHEMICAL CHARACTERISTICS OF CRUDE OILS FROM QAIDAM BASIN[J]. Oil & Gas Geology, 1983, 4(1): 121-127.
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URL: http://ogg.pepris.com/EN/10.11743/ogg19830111
http://ogg.pepris.com/EN/Y1983/V4/I1/121