Lithologic Reservoirs ›› 2025, Vol. 37 ›› Issue (4): 84-94.doi: 10.12108/yxyqc.20250408

• PETROLEUM EXPLORATION • Previous Articles    

Distribution law of remaining gas in condensate gas reservoirs in fault-controlled body of No. 4 fault zone in Shunbei Oilfield， Tarim Basin

JIANG Shan1,2, TANG Yongjian1,2, JIAO Xiarong3, LI Wenliang4, HUANG Cheng4, WANG Ze5   

  1. 1. Key Laboratory of Complex Shale Oil and Gas Geology and Development in Southern China, Yangtze University, Wuhan 430100, China;
    2. Unconventional Oil and Gas Geological Engineering Research Center, Yangtze University, Wuhan 430100, China;
    3. Hydrogeological Engineering Geology Brigade, Hubei Geological Bureau, Jingzhou 434020, Hubei, China;
    4. The Fourth Oil Production Plant of Sinopec Group Northwest Petroleum Branch, Urumqi 830011, China;
    5. CNPC Chuanqing Drilling Engineering Company Limited, Chengdu 610083, China
  • Received:2025-04-07 Revised:2025-05-19 Published:2025-07-05

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Abstract: Carbonate condensate gas reservoirs in Ordovician fault-controlled bodies of No. 4 fault zone in Shunbei Oilfield of Tarim Basin are with low recovery efficiency and rapid decline in formation pressure. The characteristics of remaining gas distribution and main controlling factors of Ordovician condensate gas reservoirs in No. 4 fault zone of Shunbei Oilfield were studied by numerical simulation methods， and the remaining gas distribution patterns of condensate gas reservoirs were summarized. The results show that： （1）Shunbei Oilfield has developed various small-scale strike-slip fault zones， which have formed fault-controlled reservoirs with relatively large burial depths. The effective storage space is mainly composed of fault cavities and fractures. Fault-controlled reservoirs are distributed in strip along the strike-slip fault zone， and develop multiple sets of fracture-cavity assemblages consisting of an orderly arranged of bedrock-fracture zone-cave zone-fracture zone-bedrock zone in the direction vertical to the fault zone，known as grid cluster structure.（2）The remaining gas in the reservoirs developed by a single well in the study area has sporadically distributed. When two fault surfaces of the reservoirs are not connected，the condensate gas from one fault surface is utilized while the other surface forms remaining gas. When the reservoirs consist of multiple isolated fault-controlled bodies， the remaining gas distribute in blocks.When the reservoirs are strongly affected by bottom water， the remaining gas is sealed off by the bottom water and distribute at the top of the reservoir. The remaining gas in the reservoirs developed by multi-well has the distribution characteristic of being patchy.When there are obvious high-speed gas drive channels within the reservoir， there is a large amount of trapped remaining gas along the channel edges.When the connectivity between injection and production wells is good， the injected gas advances in a piston manner， with remaining gas distributed around the production wells in sheet shape. The distribution of remaining gas from single well development is mainly controlled by geological factors and hydrodynamic conditions， while that from multi-well development is primarily influenced by injection and production conditions as well as geological factors.（3）The distribution of remaining gas in fault-controlled condensate gas reservoirs in the study area is characterized by seven models，which are isolated type，structural control type，sealing plugging type， bottom water plugging type of single wells， and isolated type， trapped near gas drive channels type， and injection-production control type of multi-well.

Key words: numerical simulation, condensate gas reservoir, remaining gas, fault-controlled body, Ordovician, Shunbei Oilfield, Tarim Basin

CLC Number: 

  • TE344
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