Oil & Gas Geology ›› 2005, Vol. 26 ›› Issue (1): 78-85.doi: 10.11743/ogg20050110

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A studying of Cenozoic fracture systems in Bachu-Kalpin area, Tarim Basin

Xiao Ancheng1, Yang Shufeng1, Li Yuejun2, Wang Qinghua3, Chen Hanlin 1   

  1. 1. Geosciences Department of Zhejiang University, Hangzhou, Zhejiang;
    2. Geology &Geophysics Institute of Chinese Academy of Sciences, Beijing;
    3. Tarim Oilfield Company of PetroChina, Korla, Xinjiang
  • Received:2004-11-23 Online:2005-02-25 Published:2012-01-16

Abstract:

Strikes of fault system in Bachu uplift, a secondary structural unit in Tarim basin, are mainly NNW, while those in the neighboring Kalpin thrust belt to the north, part of South Tianshan tectonic system, are nearly EW. These two fracture systems are nearly orthogonal in the plane view. Mesozoic and Cenozoic are absent in a large area in Bachu uplift, so it is difficult to determine the exact time of activity of the fracture system. Comparing the features of Cenozoic sequences and analysing their contact relations shows that the N-S fracture system in Bachu uplift began to come into being in Miocene and extended northward into Kalpin structural belt. The corresponding relations between the N-S fracture systems in the two structural units are studied in this paper.It is pointed out that the E-W fracture system in Kalpin area was active mainly after Pliocene(N2). The present N-S and E-W fracture systems in Kalpin structural belt are the results of superimposition of structures in different stages. Structural geologic models of Bachu and Kalpin fracture systems are also presented in this paper.

Key words: Tarim Basin, Bachu fracture system, Kalpin fracture system, time of fracture formation

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