Oil & Gas Geology ›› 2007, Vol. 28 ›› Issue (4): 466-472.doi: 10.11743/ogg20070404

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Compartments in the Upper Paleozoic of northern Ordos basin and their relationship with gas enrichment

Li Zhongdong1, Hao Shumin2, Li Liang2, Hui Kuanyang2, Guo Min1, Wang Zhen1   

  1. 1. State Key Lab of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu, Sichuan 610059;
    2. SINOPEC North China Company, Zhengzhou, Henan 450006
  • Received:2007-06-08 Online:2007-08-25 Published:2012-01-16

Abstract:

Based on previous research data of sedimentary burial history,hydrocarbon-generating history,geothermal history,inclusion analysis,denuded thickness,deposition velocity,and etc.,in the northern Ordos basin,a study is initiated with the aim of understanding the pattern of abnormal pressure distribution,and the genesis and evolution of pressure in the Upper Paleozoic of the basin by combining its characteristics of universal low abnormal pressure,tight reservoirs,simple sturctures,dispersed gas pays,and compartment-controlled gas accumulation.The results confirm the existence of favorable geological conditions for developing compartments in the Upper Paleozoic of the basin.The Upper Paleozoic is recognized to be a complicate gas system with high and low pressure coexisted in compartments,i.e.the reservoir belongs to normal pressure-abnormal low pressure,while the mudstone still maintains high pressure.The study also suggests that the shape,inner structure,and sandstone-mudstone relationship of the compartment decide the distribution of gas reservoirs in the compartment.

Key words: Upper Paleozoic, pressure compartment, gas distribution inside compartment, northern Ordos basin

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