Oil & Gas Geology ›› 2014, Vol. 35 ›› Issue (1): 116-123.doi: 10.11743/ogg20140114

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Structural characteristics and active ages of the Gudongshan fault belt in Bachu uplift, Tarim Basin

Yang Yong1,2, Tang Liangjie1,2, Yue Shujuan3, Huang Taizhu4, Yun Lu4, Xie Daqing4   

  1. 1. State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum, Beijing 102249, China;
    2. Basin and Reservoir Research Center, China University of Petroleum, Beijing 102249, China;
    3. Research Institute of Production Technology, Zhongyuan Oilfield Company, SINOPEC, Puyang, Henan 457001, China;
    4. Northwest Oilfield Company, SINOPEC, Urumqi, Xinjiang 830011, China
  • Received:2012-10-12 Revised:2013-12-24 Online:2014-02-08 Published:2014-03-26

Abstract: 2-D seismic data interpretation combined with structural analysis was used to build a geometry model and determine active ages of the Gudongshan fault belt.The formation and evolution of this fault belt with complicated tectonic deformation may be closely related to the evolution of oceanic basins and orogenic belts around Tarim Basin.Faulting activities were the most obvious in key tectonic periods of Tarim Basin,namely the Middle Caledonian,Early Hercynian,Middle Hercynian,Early Himalayan and Later Himalayan.Faults No.1 and No.2 in the Gudongshan fault belt control the thickness of the Palaeozoic strata on both sides of the belt and also show signs of multiple-stage activities.Fault No.1 was active during phase Ⅰ and Ⅲ of the Middle Caledonian and shows feature of progress intensification of its activity.Fault No.2 was developed in the Early Hercynian and successively experienced negative inversion in the Carboniferous and positive inversion at the end of Paleogene.Fault No.3 was formed in the Early Himalayan and controlled the tectonic framework of the Precambrian basement which is higher in southwest and lower in northeast.Faults No.4 and No.5 were developed in the Later Himalayan.The former has a thrust displacement up to 20 km and a denudation-caused monocline at the hanging wall.

Key words: multiple-stage faulting, structural characteristics, structure inversion, fault belt, Bachu uplift

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