Oil & Gas Geology ›› 2009, Vol. 30 ›› Issue (2): 149-155.doi: 10.11743/ogg20090204

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Comparison between the Upper Paleozoic gas reservoirs in Ordos Basin and deep basin gas reservoirs

Li Zhongdong1, Hao Shuming2, Li Liang2, Xi Kuanyang2, Guo Min1   

  1. 1. National Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu, Sichuan 610059, China;
    2. SINOPEC North China Company, Zhengzhou, Henan 450006, China
  • Received:2008-11-27 Online:2009-04-25 Published:2012-01-16

Abstract:

A comparison between the Upper Paleozoic gas reservoirs in Ordos Basin and typical deep basin gas reservoirs was carried out through analysis of sandstone and shale compaction,pore evolution,pressure forming mechanism,gas and water distribution,gas migration and accumulation,pooling characteristics,as well as previous research results.These two kinds of gas reservoirs show some similarities in terms of basic pooling conditions and certain manifestations.However,dynamic data from gas development indicate that the Upper Paleozoic gas reservoirs are characterized by poor connectivity of gas layers,multiple pressure systems,no extensive inversion of gas-water contact,the existence of local edge water,and the control of structure location and favorable reservoir facies belts on gas-water distribution.A research on process,key conditions,and mechanisms of hydrocarbon pooling suggests that the Upper Paleozoic gas reservoirs belong to lithologic or structural-lithologic gas reservoirs featuring in near-source migration,accumulation,and pooling.It is therefore concluded that the Upper Paleozoic gas reservoirs distinguish themselves from deep basin gas reservoirs by poor connectivity of reservoirs and control of lithology and structure on traps.

Key words: deep basin gas reservoir, Upper Paleozoic, pooling characteristic, Ordos Basin

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