新疆石油地质

新疆石油地质 ›› 2006, Vol. 27 ›› Issue (4): 414-418.

• 油气勘探 • 上一篇    下一篇

南阳凹陷高蜡原油的地球化学特征

李水福, 何生, 张冬梅   

  1. 中国地质大学 资源学院石油系, 武汉 430074
  • 收稿日期:2005-11-02 修回日期:2006-01-26 出版日期:2006-08-01 发布日期:2020-10-19
  • 作者简介:李水福(1962-), 男, 江西玉山人, 副教授, 有机地球化学,(Tel) 027-67884778(E-mail) lishf@cug.edu.cn.

Organic Geochemical Characteristics of High Wax Oils in Nanyang Sag

LI Shui-fu, HE Sheng, ZHANG Dong-mei   

  1. Department of Petroleum Engineering, Faculty of Earth Resources, China University of Geosciences, Wuhan, Hubei 430074, China
  • Received:2005-11-02 Revised:2006-01-26 Online:2006-08-01 Published:2020-10-19

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摘要： 南阳凹陷原油为低密度、低粘度、低含硫和高凝固点的正常原油,高蜡-特高蜡也是南阳凹陷原油的主要特征。饱和烃含量高,饱和烃/芳香烃值大于3.0.C27—C29规则甾烷均呈“V”字型分布,C29甾烷异构化作用较强,其比值为0.3~0.6.萜烷以五环三萜烷和长链三环萜烷为主,非藿烷系列(尤其是伽马蜡烷)含量相当丰富。个别样品伽马蜡烷指数高达1.3,为高盐度强还原环境。芳香烃组分以菲为优势组分,其次为萘系列,三芳甾烃在张店地区相对较低,且变化幅度较大。

关键词: 南阳凹陷, 高蜡原油, 生物标志物, 芳烃, 地球化学特征

Abstract: The crude oil from Nanyang sag is characterized by low density, low viscosity, low sulfur content and high freezing point, being normal crude oil with high-to abnormal high-wax content, high saturated hydrocarbon content, saturated/aromatic hydrocarbon ratio of more than 3.0, V-shape distribution of C27—C29 regular steranes with high isomerization of C29 sterane and the S/R+S ration of 0.3~0.6. The terpane is dominated by penta-triterpanes and long-chain tricycloterpanes; the non-hopane series (especially gammacerane) are quite abundant. The gammacerane index of individual sample is up to 1.3, indicating a high-salinity and strong-reduced environment. The aromatic components are dominated by phenanthrene and then the naphthalene series. The tri-aromatic steroids content of crude oil is relatively low in Zhangdian area and shows a wide range.

Key words: Nanyang sag, high-wax oil, biomarker compound, aromatic hydrocarbon, geochemistry

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