Abstract
Crude oil samples taken from the southern part of western Qaidam Basin were analyzed with GC/MS in order to understand the geochemical characteristics of crude oils. The results reveal that most crude oils are characterized by high abundance of gammacerane and C35 homohopane, which are the representative characteristics of saline lacustrine crude oils. Based on the variation of the ratios of gammacerane/C30 hopane (G/H) and C35 homohopane/C34 homohopane (C35/C34H), two crude oil groups, A and B, are identified. Group-A crude oils mainly occurr in the north of the study area, with higher ratios of G/H (>0.8) and C35/C34H (>1.2), whereas group-B crude oils, selected from the south of the study area, show lower ratios of G/H (<0.8) and C35/C34H (<1.0). In addition, group-A crude oils are distinguished into three subgroups in accordance with their different ratios of G/H and C35/C34H and different distribution characteristics of n-alkanes, isoprenoids and steranes. These may be helpful for understanding the distribution characteristics of crude oils in the southern part of western Qaidam Basin and providing clues to the forthcoming exploration of crude oils and gas.
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References
Aquino Neto F.R., Trendel J.M., Restle A., Connan J., and Albrecht P.A. (1983) Occurrence and formation of tricyclic and tetracyclic terpanes in sediments and petroleum. In Advances in Organic Geochemistry (ed. M. Bjory) [M]. pp.659–667. Wiley, New York.
Duan Yi, Zhang Hui, Zheng Chaoyang, and Wu Baoxiang (2004) Study on genesis of crude oil from Qaidam Basin [J]. Acta Sedimentologica Sinica. 22, 61–65 (in Chinese with English abstract).
Ekweozor C.M. and Strausz O.P. (1983) Tricyclic terpanes in the Athabasca oil sands: Their geochemistry. In Advances in Organic Geochemistry (ed. M. Bjor/y) [M]. pp.746–766. Wiley, New York.
Fu Jiamo, Sheng Guoying, Xu Jiayou, Eglinton G., Gowar A.P., Jia Rongfen, Fan Shanfa, and Peng Pingan (1990) Application of biological markers in the assessment of paleoenvironments of Chinese non-marine sediments [J]. Org. Geochem. 16, 769–779.
Huang Difan, Li Jinchao, and Zhang Dajiang (1991) Maturation sequence of Tertiary crude oils in the Qaidam Basin and its significance in petroleum resource assessment [J]. Journal of Southeast Asian Earth Sciences. 5, 359–366.
Huang Difan, Zhang Dajiang, Li Jingchao, and Huang Xiaoming (1989) The Tertiary oil source correlation in Qaidam Basin [J]. Acta Sedimentologica Sinica. 7, 1–13 (in Chinese with English abstract).
Moldowan J.M., Seifert W.K., and Gallegos E.J. (1985) Relation between petroleum composition and depositional environment of petroleum source rocks [J]. American Association of Petroleum Geologists Bulletin. 69, 1255–1268.
Peters K.E. and Moldowan J.M. (1993) The Biomarker Guide: Interpreting Molecular Fossils in Petroleum and Ancient Sediments [M]. pp.111–210. Englewood Cliffs, Prentice Hall., Inc, New Jersey.
Sinninghe Damste J.S., Kenig F., Koopmans M.P., Koster J., Schouten S., Hayes J.M., and De Leeum J.W. (1995) Evidence for gammacerane as an indicator of water column stratification [J]. Geochim. Cosmochim. Acta. 59, 1895–1900.
Tuo Jincai, Shao Hongshong, and Huang Xingzhen (1994) The relationship between some geochemistry parameters and environment in saline facies [J]. Acta Sedimentologica Sinica. 12, 114–119 (in Chinese with English abstract).
Welte D.H. and Waples D. (1973) Uber die Bevorzugung geradzahliger n-alkanes in sediment gesteinen [J]. Naturwissensch. 60, 516–517.
Zhang Min and Zhao Hongjing (2004) Reservoir geochemistry of the Kuche petroleum system in the Tarim Basin, China [J]. Chinese Journal of Geochemistry. 23, 163–168.
Zhang Min, Huang Guanghui, and Hu Guoyi (2006) Reservoir geochemistry of the Tazhong Oilfield in the Tarim Basin, China, Part I. Geochemical characteristics and genetic classification of crude oils [J]. Chinese Journal of Geochemistry. 25, 328–331.
Zhu Yangming, Wen Huanxin, Su Aiguo, Liang Digang, and Peng Dehua (2005) Geochemical characteristics of Tertiary saling lacustrine oils in the Western Qaidam Basin, northwest China [J]. Applied Geochemistry. 20, 1875–1889.
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Li, H., Zhang, M., Zhang, C. et al. Geochemical characteristics and genetic types of crude oils from the Tertiary system in the southern part of western Qaidam Basin, Northwest China. Chin. J. Geochem. 27, 285–290 (2008). https://doi.org/10.1007/s11631-008-0285-x
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DOI: https://doi.org/10.1007/s11631-008-0285-x