Oil & Gas Geology ›› 2009, Vol. 30 ›› Issue (1): 97-101,107.doi: 10.11743/ogg20090114

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Origin and distribution patterns of carbon dioxide in the Songliao Basin

Lu Xuesong1, Wang Zhaohong2, Wei Lichun1,3, Liu Shaobo1, Hong Feng1   

  1. 1. PetroChina Exploration and Development Research Institute, Beijing 100083, China;
    2. China University of Petroleum, Beijing 102249, China;
    3. Basin & Reservoir Research Center, China University of Petroleum, Beijing 102249, China
  • Received:2008-08-11 Online:2009-02-25 Published:2012-01-16

Abstract:

Various indexes such as CO2 carbon isotope,3He/4He and CO2/3He ratios show that CO2 with high content in the Songliao Basin is mantle-derived gas.Distribution of CO2 in the Songliao Basin is highly uneven.The content of CO2 in the Songliao Basin shows a kind of "two-end member" distribution.Vertically,CO2 are mainly concentrated in the Yingcheng Formation and the fourth member of the Quantou Formation and their distribution is under the control of regional caprock and reservoir characteristics.While laterally,they are locally distributed in several patchy or narrow-and-long zonal areas,and their distribution is obviously under the control of deep major faults and has relatively close genetic relations with the basement faults and volcanic rock bodies.Conventional hydrocarbon gas and mantle-derived CO2 occur in hybrid,as both of them are controlled by the major basement faults and sharing some trap and reservoir elements.It was pointed out that,to a great extent,the combination type of pathways for mantle-derived CO2 migration and accumulation determined the relative content of CO2 and hydrocarbon gas in volcanic reservoirs and accumulating horizons of CO2-bearing natural gas.

Key words: mantle-derived origin, migration and accumulation pathway, genetic type, carbon dioxide, Song-liao Basin

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