Oil & Gas Geology ›› 2005, Vol. 26 ›› Issue (1): 86-91.doi: 10.11743/ogg20050111

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Tectonic evolution and development and distribution of fans on northwestern edge of Junggar Basin

Lei Zhenyu1, Lu Bing2, Wei Yuanjiang1, Zhang Liping1, Shi Xin1   

  1. 1. Petroleum Exploration and Development Research Institute, PetroChina, Beijing;
    2. Petroleum Exploration and Development Company, PetroChina, Beijing
  • Received:2005-01-09 Online:2005-02-25 Published:2012-01-16

Abstract:

The northwestern edge of Junggar Basin experienced multiphase tectonic movements of different natures, and it appeared as a foreland basin since Cenozoic. Extensive collision, compression and thrusting occurred along with regional tectonic movement, and faulting apparently had the nature of overthrusting, resulting in fold structures to be in parallel with the fracture zone. The overthrust faults were commonly syngenetic and controlled obviously the development of fans. Thrusting occurred continuously, so topographies on the hanging walls were greatly different from those on the footwalls. Clastics denuded from the thrust sheets accumulated on the foot of fault scarps, leading to the formation of various fans (alluvial fan, fan delta and submarine fan, etc.). Step thrust faults led to the formation of multistage fans. Tectonic activities attenuated gradually from Permian to Jurassic and the sizes of fans decreased gradually. Lateral displacement of tectonic activities resulted in the migration of fans. As a whole, the strongest and longest tectonic activities occurred in Baikouquan-Xiazijie area, hence the fans in that area would be relatively large, highly superimposed and largely migrated; while those in Cheguai-Karamay area were relatively weak, so the fans would be small, poorly superimposed and shortly migrated.

Key words: northwestern edge of Junggar Basin, tectonic evolution, faulting, fan migration

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