Geochemical Characteristics of Crude Oils from Wunan Oilfield, Qaidam Basin

详细信息   

• 责任者：Zhang Mingfeng (Key Laboratory of Petroleum Resources Research ; Institute of Geology and Geophysics ; Chinese Academy of Sciences ; Lanzhou 730000 ; China) ; Tuo Jincai
• 刊名：Natural Gas Geoscience
• 出版年：2011
• 卷期：22(5)
• 关键词：原油 ; crude oil ; 地球化学 ; geochemistry ; 柴达木盆地 ; Qaidam Basin
• 页码：p.840-847
• 图表：8 illus., 3 tables, 27 refs.
• 分类号：1003
• issnNo：ISSN1672-1926
• isbnNo：CN62-1177/TE

摘要

 
    

By measuring the stable carbon isotopes of satisfied hydrocarbon, aromatics and single hydrocarbons in crude oil collected from the Wunan oilfield in southwest margin of Qaidam basin, the authors discuss the geochemical features of the crude oil. The results indicate that the n-alkanes present a bimodal distribution pattern, associated with low ratios of Pr/Ph(<0.5) and C₃₅-Hopane/C₃₄-Hopane(<1.0), high abundance of tricyclic-terpanes and gammacerane, and occurrence of hopane (C₃₅). These results confirm that the crude oils in the Wunan oilfield were formed in a mild-salty to salty reduction depositional environment, and the parent input matter mainly derived from the lower aquatic organisms.