Lithologic Reservoirs ›› 2011, Vol. 23 ›› Issue (5): 9-15.doi: 10.3969/j.issn.1673-8926.2011.05.003

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Hydrocarbon migration law and model of Chang 9 reservoir in Jiyuan area, Ordos Basin

LIU Xianyang 1，2，DENG Xiuqin 1，2，ZHAO Yande 1，2，ZHANG Xuefeng 1，2，HAN Tianyou 1，2   

  1. 1. Research Institute of Exploration and Development， Changqing Oilfieid Company， PetroChina， Xi’an 710018， China； 2. National Engineering Laboratory for Exploration and Development of Low-Permeability Oil & Gas Fields, Xi’an 710018， China
  • Online:2011-10-20 Published:2011-10-20

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Abstract:

The research means and methods of reservoir geochemistry, reservoir geology and sedimentology are applied to discuss the hydrocarbon sources, migration mechanism, dynamics and accumulation pattern of Chang 9 reservoir in Jiyuan area. The result shows that the crude oil of Chang 9 reservoir comes primarily fromthe high-quality hydrocarbon source rocks ofChang 7 reservoir, ofwhich the hydrocarbon migrated downward and accumulated in Chang 9 reservoir. The main dynamic ofChang 7 hydrocarbon migrating to Chang 9 reservoir is mainly fromthe abnormal high pressure of Chang 7 hydrocarbon source rock hydrocarbon pressurization and excess pressure difference between Chang 7 and Chang 9 reservoir. The vertical superposition and lateral connecting sand bodies and the fractures formed in the regional tectonic activity are the favorable migration path for connectingChang 7 high-quality hydrocarbon source rocks with Chang 9 reservoir.

Key words: micropore, diagenesis, sandstone reservoir, Jurassic, Lunnan area

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