Oil & Gas Geology ›› 2004, Vol. 25 ›› Issue (6): 620-624.doi: 10.11743/ogg20040604

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Nature of Mesozoic basins in the northern edge of Qaidam basin

Liu Zhihong1, Yang Jianguo2, Wan Chuanbiao1,2, Liu Zhenwen2, Zhang Liguo 2   

  1. 1. College of Earth Sciences, Jilin University, Changchun, Jilin;
    2. Daqing Exploration and Development Research Institute, Daqing Oilfield Inc., CNPC, Daqing, Heilongjiang
  • Received:2004-11-02 Online:2004-12-25 Published:2012-01-16

Abstract:

A series of half graben like faulted basins were developed in Jurassic in the northern edge of Qaidam basin, which was mainly controlled by extensional tectonic framework. The sedimentation of the Middle and Lower Jurassic in the fault depression was remarkably controlled by faults, thus the Early Middle Jurassic basin was faulted basin. While faults basically had no impacts on the sedimentation of the Upper Jurassic, thus the Late Jurassic basin was a downwarped basin. In Cretaceous, the northern edge of Qaidam basin was mainly controlled by compressional tectonic framework, with fault propagation folds to be formed in the process of compression in the foreland of Qilianshan. The Cretaceous sedimentation was controlled by the fault propagation folds formed during the process of compression, thus the Cretaceous basin was a compressional basin.

Key words: Mesozoic, fault basin, down warped basin, compressional basin, Qaidam basin

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