Preliminary Study on Saturate Components Characteristics and Its Origin of Ful ing Formation Immature Source Rock in Jinghu Sag
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摘要: 本文应用气相色谱(GC)、色谱—质谱(GC-MS)和线性同位素质谱(GC-C-MS)分析技术对苏北盆地金湖凹陷下第三系阜宁组阜二段低熟烃源岩饱和烃组分及单体烃稳定碳同位素组成进行了深入地研究,发现甾烷类(特别是ααα（20R）-C29甾烷)在饱和烃中含量很高,正构烷烃呈三峰型分布,以nC22或nC20为主峰。最后根据烃源岩有机显微组分和单体烃碳同位素组成特征认为正构烷烃中低碳数(19)和中等碳数(nC19—nC23)正构烷烃可能主要来源于菌藻类,高碳数(>nC23正构烷烃主要来源于高等植物的蜡质;甾烷类(包括高丰度C29甾烷)大部分可能主要由藻类贡献。Abstract: The Saturate components characteristics and its' stable carbon isotope composition of individual n-alkanes of Fuling For-mation immature source rock from Jinghu sag in SuBei Basin have been studied in detail by means of GC, GC-MS and GC-C-MS. As a result，the content of steranes (especially aaa(20R)-C20sterane) of saturate is very abundant. There are threemajor peaks in the distribution of normal alkanes. The highest peak is C22 or C20 normal alkane. According to the study of themaceral composition and the variation in stable carbon isotope of individual hydrocarbons, it is proposed that middle molecularweight (nC19-nC22) normal alkanes are derived from bacteria and algae and steranes (including abundent Cz9 sterane) mainlycome from algae.
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Key words:
- normal alkanes /
- steroids /
- individual normal hydrocarbon isotopes /
- algae source
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[1] 曾宪章.梁第刚等编著.中国陆相原油和生油岩中的生物标志物.兰州:甘肃科学出版社，1989. [2] 程克明，王铁冠等.烃源岩地球化学科学出版社.1995. [3] Martin R. L. et al.。Distrihutions of n-Paraffins in Crude Oilsand Their Implications to Origin of Petroleum. Nature, 1963.199:1190~1193. [4] Meinschein W. G. and Hung W. Y.，Sterols, Stanols, Steranesand the Origin of Natural Gas and Petroleura, Ed. Atkinson G.and Zu ckerman J. L.，Perganmon Press, 1981，33~35. [5] Johns R. B.，Biological Markers in the Sedimentary Record.Methods in Geochemistry and Geophysics 24，Elsevier. New York. 1986 . 364. [6] Roger et al.，Dinosterane and other Hydrocarbons of Dinoflagel-late Origin in Sediments and Petroleum. Geochimica Acta,1987. 51: 3075~3082. -
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