Oil & Gas Geology ›› 2008, Vol. 29 ›› Issue (2): 261-267.doi: 10.11743/ogg20080216

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Distribution and sequence stratigraphic framework of the Jurassic strata on the northwestern margin of the Junggar Basin

Qi Liqi1, Bao Zhidong1, Wu Boran1, Li Weifeng2, Yuan Lichuan3   

  1. 1. Faculty of Resources & Information, China University of Petroleum, Beijing 102249, China;
    2. School of Geosciences, Yangtze University, Jinzhou, Hubei 434100, China;
    3. Urumqi Branch of PetroChina BGP Institute, Urumqi, Xinjiang 830016, China
  • Received:2008-02-13 Online:2008-04-24 Published:2012-01-16

Abstract:

The sequences in Junggar basin were influenced by the major fault on the northwestern margin.The Jurassic is relatively thick in the footwall of the major fault,but is relatively thin or even absent in the hanging wall.However,based on available drilling,log,and seismic data in the study area,this paper recognized 2 structural sequences(JTS1,JTS2),7 sequences(Ⅰ-Ⅶ),and 10 system tracts in the Jurassic by employing classical sequence stratigraphy theory and approaches.It suggests that the occurrence of coal layers bears important significance in sequence demarcation and that the controlling factors for the Jurassic sequence stratigraphy on the northwestern margin of Junggar basin include tectonic movement,sediment supply,lake level rise and fall,and climate.Among them,the tectonic movement and lake level rise and fall are considered the most important.

Key words: sequence stratigraphy, system tract, coal bed, controlling factor, Junggar Basin

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