新疆石油地质

新疆石油地质 ›› 1997, Vol. 18 ›› Issue (2): 130-134.

• 有机地球化学 • 上一篇    下一篇

新疆三塘湖盆地侏罗系煤成油初次运移机理探讨

霍永忠, 钟宁宁   

  1. 中国地质大学能源系 北京 100083
  • 收稿日期:1997-03-05 出版日期:1997-06-01 发布日期:2021-01-18
  • 作者简介:霍永忠,博士 地球化学

MECHANISM OF PRIMARY MIGRATION OF COAL-FORMED OIL N THE JURASSIC OF SANTANGHU BASIN, XINJIANG: DISCUSSION

Huo Yongzhong, Zhong Ningning   

  1. Department of Engery Resources, China University of Geoscience,Beijing 100083
  • Received:1997-03-05 Online:1997-06-01 Published:2021-01-18
  • About author:Huo Yongzhong,Doctor, Geochemistry

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摘要： 通过对新疆三塘湖盆地侏罗系煤的物理性质及其演化规律的剖析,结合煤生油的有机岩石学及有机地球化学特性研究,认为,镜质体反射率Ro在0.65%~0.85%演化阶段煤的生油量大于其孔隙的容纳量,构成了煤成油初次运移的基本条件。在煤可塑性传递.上覆压力产生的煤层内孔隙流体高压作用下,导致孔隙连通并形成微裂隙,煤成油沿微裂隙以连续“沥青网络”的形式发生初次运移。由于侏罗系煤处于有机质成熟阶段早期,在排驱时间上存在“早生早排”的可能性。侏罗系煤中特定的生油母质、有机质成熟度及排驱机理决定了煤成油的重质、高蜡和高粘度特点。

关键词: 新疆, 三塘湖盆地, 煤成油, 初次运移, 侏罗纪

Abstract: Based on the analysis of physical properties of Jurassic coal and their evolution regularity in Santanghu basin, Xinjiang, combined with the study on onganic petrology and organic geochemistry of coal-formed oil, this paper considered that the amount of oil generation in the coal is higher than its pore storge capacity at Ro = 0.65% ~ 0. 85%, which requires the forced primary migration of coal-formed oil. The high-pressure of fluid in the coalbed, induced by plastic compaction, resulted in the pore connectivity and microfracture along which coal-formed oil migrated in successive bituminous network. There is the possibility of early generation and early expulsion because of Jurassic coal at early maturity level. The coal-formed oil is characterized by heavy end components, high wax content and high viscosity which is determined by Kerogen, maturity and expulsion mechanism in the coal-bearing Jurassic.

Key words: Xinjiang, Santanghu basin, Coal-formed oil, Primary migration, Jurassic