Oil & Gas Geology ›› 2016, Vol. 37 ›› Issue (4): 556-564.doi: 10.11743/ogg20160412

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Tectonic evolutionary characteristics and their causes of Chepaizi Uplift in Junggar Basin

Hu Qiuyuan1, Dong Dawei2, Zhao Li3, Li Li4, Li Xiao1, Kong Xue1   

  1. 1. Department of Oil & Gas Engineering, Shengli College of China University of Petroleum, Dongying, Shandong 257000, China;
    2. Higher Education Research and Evaluation Center, Shengli College of China University of Petroleum, Dongying, Shandong 257000, China;
    3. Wuxi Research Institute of Petroleum Geology, SINOPEC, Wuxi, Jiangsu 214122, China;
    4. School of Geosciences, China University of Petroleum(East China), Qingdao, Shangdong 266580, China
  • Received:2016-03-02 Revised:2016-06-06 Online:2016-08-08 Published:2016-09-06

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Abstract: Chepaizi Uplift in Junggar Basin is abundant in oil and gas resources and has unique tectonic evolution history.New understanding of the history was made possible recently with the latest exploration progress in the area.By combining balanced section technique with quantitative analyses of basic tectonic characteristics and activity parameters and physical structure modeling experiments,we discussed systematically in this paper the tectonic evolutionary characteristics and genesis from a spatial and temporal perspective.The result shows that the evolutionary history of the Uplift can be divided into four stages:the initial development stage (C3-P),continuously uplifting stage (T-J),stably burying stage (K-E) and local stretching tilting stage (N-Q),since it was initiated during Late Carboniferous and then went through successively strong-weak-weaker compression and a weak extension.The tectonic evolution was mainly controlled by major changes in the tectonic stress field in the Uplift and its adjacent areas since the Late Carboniferous.During the C3-P period,an eastward "escaping tectonic compression" developed in the Uplift under the control of the E-W compression stress field,leading to the development of the nearly SN-trending Hongche fault belt in the east of the Uplift and large amounts of SN-trending secondary reverse faults in the major part of the Uplift.During the T-J period,the Uplift was in the NW-SE compression stress field on the top of the thrust wedge,and went through continuous uplifting,leading to the inheritance activities of some early reserve faults.During the K-E period,the Uplift experienced integral and slow subsidence and got stably buried.And during the N-Q period,the stress field turned to be NNE-trending extensional stress field,leading to local stretching and tilting.Large amounts of NWW-trending normal faults were developed while some early reverse faults experienced negative structural inversion.Controlled by the tectonic stress field,the regional tectonic line had turned from near SN direction to NE-SW trend and then to EW direction.

Key words: balanced section, fault system, tectonic escape, tectonic evolution, Chepaizi Uplift, Junggar Basin

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