Lithologic Reservoirs ›› 2020, Vol. 32 ›› Issue (3): 56-67.doi: 10.12108/yxyqc.20200306

• PETROLEUM GEOLOGY • Previous Articles     Next Articles

Natural gas accumulation patterns of Upper Paleozoic in eastern Hangjinqi area，Ordos Basin

LIU Yuzuo1, SHI Wanzhong1,2, LIU Kai1, WANG Ren1, WU Rui1   

  1. 1. School of Resources, China University of Geosciences, Wuhan 430074, China;
    2. Key Laboratory of Tectonics and Petroleum Resources, Ministry of Education, China University of Geosciences, Wuhan 430074, China
  • Received:2019-10-20 Revised:2020-01-20 Online:2020-05-21 Published:2020-04-30

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Abstract: In order to understand the gas accumulation model of the Upper Paleozoic in Hangjinqi area of Ordos Basin,and to guide the oil and gas exploration in this area,based on the depth analysis of the distribution of source rock,natural gas migration and trap distribution,this paper summarized the hydrocarbon accumulation model in this area. The results show that:source rocks in the study area are thick in the south and thin in the north,with high maturity in the south and low maturity in the north. These traps are mainly distributed in the northern region of Boerjianghaizi fault(Shenguhao region). The density of natural gas in the south is higher than that in the north. The whole shows a downward trend from south to north. The natural gas drying coefficient of the study area is also increasing gradually from south to north. The natural gas in Shenguhao area,which reflects the lack of hydrocarbon source rocks,is mainly transported from the south area of Boerjianghaizi fault. Highquality hydrocarbon source rocks are developed in the south area of Boerjianghaizi fault. The distribution characteristics of high natural gas density and low drying coefficient indicate that the natural gas is in situ accumulation in this area. The faults and associated structural traps are the migration channels and gathering places of oil and gas in Azhen area. Near source natural gas reservoir is formed in Shirigaohan area under the control of sandstone reservoir property and the influence of fault nondevelopment. The nature gas accumulation patterns of Upper Paleozoic in eastern Hangjinqi were divided into three types:horizontal long-distance migration,vertical near-distance in-situ accumulation and reservoir forming model of quasi continuous tight sandstone gas. The research results indicate the direction for the next exploration in Hangjinqi area.

Key words: natural gas, accumulation pattern, accumulation type, reservoir forming model of quasi continuous tight sandstone gas, Upper Paleozoic, Hangjinqi, Ordos Basin

CLC Number: 

  • TE132.2
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