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现代地质 ›› 2010, Vol. 24 ›› Issue (6): 1079-1084.

• 生烃与油气成藏 • 上一篇    下一篇

海相页岩二次生烃潜力热模拟实验研究

辛艳朋1,2,秦建中3,郑伦举3,邱楠生1,2   

  1. 1.中国石油大学 油气资源与探测国家重点实验室,北京102249;2.中国石油大学 盆地与油藏研究中心,北京102249;
    3.中国石化 无锡石油地质研究所,江苏 无锡214151
  • 出版日期:2010-11-19 发布日期:2010-12-30
  • 通讯作者: 邱楠生,男,教授,博士生导师,1968年出生,石油地质学专业,主要从事含油气盆地分析研究。
  • 作者简介:辛艳朋,女,博士研究生,1982年出生,石油地质学专业,主要从事沉积盆地构造—热演化和油气成藏机理方面的研究。Email:virginiastephon@yahoo.cn。
  • 基金资助:

    国家重点基础研究发展计划(“973”)项目“中国海相碳酸盐岩层系油气形成与分布预测”(2005CB422102);中国石化海相前瞻性项目“中国陆域海相沉积盆地热史恢复方法与盆地热体制”(YPH08057)。

Secondary Hydrocarbon Generation Potential of Marine Shale Source Rocks in Thermal Modeling

 XIN  Yan-Peng1,2, QIN  Jian-Zhong3, ZHENG  Lun-Ju3, QIU  Nan-Sheng1,2   

  1. 1.State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum,Beijing102249, China;
    2.Basin and Reservoir Research Center,China University of Petroleum,Beijing102249, China;
    3.Wuxi Research Institute of Experimental Petroleum Geology,SINOPEC,Wuxi, Jiangsu214151, China
  • Online:2010-11-19 Published:2010-12-30

摘要:

利用热压模拟实验的方法,选取自然演化不同起始成熟度的海相页岩,系统研究了海相页岩二次生烃规律。研究表明,海相页岩二次生烃过程不是一次生烃的直接延续,生烃特征与一次连续生烃也有差异。随着二次生烃起始成熟度的增加,二次生油产率存在比一次连续生烃滞后的生油高峰,并且随起始成熟度增加位置更加向后推移,已经处于高演化阶段的海相页岩不再有二次生油高峰。起始成熟度控制二次生烃潜力,起始成熟度处于生油窗之前的海相页岩具有较高的二次生油和生气潜力,起始成熟度处于生油窗的海相页岩具有较高的二次生气潜力和一定的二次生油潜力;起始成熟度高于传统生油窗的海相页岩,二次生油能力已经很低,但是演化到一定程度还具有相当的生气潜力;已经达到过成熟的海相页岩基本上不具备二次生烃潜力。此研究完善了二次生烃的理论研究,对中国叠合盆地海相烃源岩的评价有很好的指导作用。

关键词: 海相页岩, 二次生烃, 模拟实验, 起始成熟度

Abstract:

Based on simulation experiments of the natural maturity marine shale samples, this article presents a brief discussion on secondary hydrocarbon generation of marine shale. The results indicate that the secondary hydrocarbon generation is not continuous with the evolution tendency of the first hydrocarbon generation of marine shale. There is a hydrocarbon generation peak during the secondary hydrocarbon generation process of low matured shale and matured shale, which is later than that of the first continuous hydrocarbon generation. The lagging is enhanced when the original maturity increases. The secondary hydrocarbon generation process of high matured shale and overmatured shale does not have a hydrocarbon generation peak.  Secondary hydrocarbon generative potential is dominated by original maturity. Marine shale which has an original maturity before being oil window has preferable secondary hydrocarbon generative potential to yield abundant oil and gas. Marine shale which has an original maturity just being in oil window has preferable secondary gas generative potential and weakened secondary oil generative potential. Marine shale which has a higher original maturity than that of oil window has poor secondary oil generative potential, but still can generate considerable quantity of gas. The marine shale which has a higher original maturity than the oil-generating dead line almost has not any secondary hydrocarbon potential. This research improves the current theory of secondary hydrocarbon generation, and can be a good guidance for evaluation on marine source rock in superimposed basin in China.

Key words: marine shale, secondary hydrocarbon generation, simulation experiment, original maturity

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