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Geoscience ›› 2017, Vol. 31 ›› Issue (03): 587-594.

• Energy Geology • Previous Articles     Next Articles

The Permo-Carboniferous Gas Reservoir Forming Model of Hangjinqi Exploration Area in Northern Ordos Basin, Inner Mongolia

LI Gongqiang1,2(), JIA Huichong3, PAN Heping4, XIE Ruijie1(), ZHAO Yonggang2, LIU Sihong3, CHEN Yulin1, LIU Donghai5   

  1. 1. College of Geosciences,Yangtze University,Wuhan, Hubei 430100,China
    2. Well Logging Company of SINOPEC North China Petroleum Engineering Company, Xinxiang, Henan 453700,China
    3. Exploration and Development Research Institute, SINOPEC North China Company, Zhengzhou, Henan 450006, China
    4. Institute of Geophysics & Geomatics, China University of Geosciences, Wuhan,Hubei 430074, China
    5. Geophysical Research Institute of BGP, CNPC,Zhuozhou,Hebei 072751, China
  • Received:2016-12-07 Revised:2017-02-27 Online:2017-06-10 Published:2017-06-27

Abstract:

In the north and south sides of Borjianghaizi-Sanyanjing fault zone of Hangjinqi exploration area in northern Ordos Basin, the accumulation conditions and features of the Permo-Carboniferous such as source rock, reservoir, the relationship between source rock and reservoir, gas and water distribution, deliverability etc have significant differences. By analyzing the differences of methane content and density of the natural gas in the south and north of the fault zone, the results show that some part of the natural gas which exists in the north of the fault zone was originated from the south. Three types of unconformity transport channel were divided. Through analyzing the characteristics of the faults, it is clear that the natural gas generated from the south could migrated to the north of the fault zone through the unconformity and faults. Combined with the analysis of source reservoir cap rock assemblage and transport features, the reservoir-forming assemblage characteristics of the coal formation gas source rock and fluvial facies compact sand in Yishan slope area which located in the south of the fault zone was determined to that the source is adjacent to the reservoir which is widely distributed, and in the inherited uplifted area which is in the north of the fault zone, local gas source condition is poor, but a side joint group with the source rock area in the south of the fault zone was formed in this area. The exploration area located in the quasi-continuous-discontinuous transition zone of the Permo-Carboniferous in the north of the Ordos Basin, based on which two different types of natural gas reservoir forming models were established. The model in the south is “the adjacent of the source and reservoir and physical property’s controlling of reservoir”, the models in the north is “dual sources’ supplying of gas, trap’s controlling of reservoir”.

Key words: Ordos Basin, Hangjinqi exploration area, Permo-Carboniferous, reservoir forming model

CLC Number: