Abstract
Light hydrocarbons, especially C7 isoalkanes, cyclopentanes, cyclohexanes and n-heptane in 540 oils from the Tarim Basin were studied systematically. The results suggested the K1 values [(2-MH+2,3-DMP)/(3-MH+2,4-DMP)] of crude oils vary from a lowest value of 0.78, to a highest value of 1.54, but the K1 values of the majority of oil samples (80%) range from 0.90 to 1.20. However, the absolute contents of (2-methylhexane+2,3-dimethylpentane) and (3-methylhexane+2,4-dimethylpentane) in the total light hydrocarbons (C4–C7) show a similar variation trend. The variation of K1 values of crude oils can suggest a typical sedimentary environment for source rocks. Therefore, according to the compositional characteristics of C7 light hydrocarbons in light of the steady-state catalytic hypothesis, nonmarine oils from the Yingmaili area and marine oils from the Tazhong uplift in the Tarim Basin were genetically classified.
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References
Mango F. D. (1987) An invariance in the isoheptanes of petroleum [J].Science.273, 514–517.
Mango F. D. (1990a) The origin of light cycloalkanes in petroleum [J].Geochim. Cosmochim. Acta. 24, 23–27.
Mango F. D. (1990b) The origin of light hydrocarbons in petroleum: A kinetic test of steady-state catalytic hypothesis [J].Geochim. Cosmochim. Acta. 54, 1315–1323.
Mango F. D. (1994) The origin of light hydrocarbons in petroleum: Ring preference in the closure of carbocyclic rings [J].Geochim. Cosmochim. Acta. 58, 895–901.
Mango F. D. (1996) Transition metal catalysis in the generation of natural gas [J].Org. Geochem. 24, 977–984.
Mango F. D. (1997) The light hydrocarbons in petroleum: A critical review [J].Org. Geochem. 26, 417–440.
Obermajer M., Osadete K. G., and Fowler M. G. (2002) Delineating compositional variabilities among crude oils from Central Montane, USA, using light hydrocarbon and biomarker characteristics [J].Org. Geochem. 33, 1333–1359.
ten Haven H. L. (1996) Application and limitations of Mango’s light hydrocarbon parameters in petroleum correlation studies [J].Org. Geochem. 24, 957–976.
Tissot B. P. and Welte D. H. (1984)Petroleum Formation and Occurrence [M]. pp. 215–220. Springer, Berlin.
Xiao Yitian and James A. T. (1997)Is Acid Catalyzed Isomerization Responsible for the Invariance in the Isoheptanes of Petroleum [C]. pp. 796–797. 18th International Meeting on Organic Geochemistry (abstracts).
Zhang Chunming, Zhao Honjing, and Mei Bowen (1998) The variance of Mango’s light-hydrocarbon parameterK [J].Chinese Journal of Geochemistry.17, 148–151.
Zhang Min, Lin R., and Mei B. (1997)Reservoir Geochemistry: Approach to Kuche Petroleum System of Tarim Basin, China [M]. pp. 20–58. Chongqing University Press, Chongqing (in Chinese).
Zhang Min and Zhang Jun (1999) Composition characteristics and geological significance of thiophene-type compounds for crude oils in Tarim Basin, China [J].Acta Sedimentologica Sinica.17, 121–126 (in Chinese with English abstract).
Zhang Min, Zhang Jun, Zhao Hongjing, and Feng Min (2004) Migration fractionation of neutral nitrogen compounds of crude oils from Tabei field in the Tarim Basin, China [J].Chinese Journal of Geochemistry.22, 89–93.
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This study was financially supported by the Natural Science Foundation of Hubei Province (No. 2004ABA144).
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Zhang, M. Compositional characteristics and geochemical significance of light hydrocarbons for crude oils in Tarim Basin, China. Chin. J. Geochem. 24, 228–231 (2005). https://doi.org/10.1007/BF02871315
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DOI: https://doi.org/10.1007/BF02871315