Oil & Gas Geology ›› 2008, Vol. 29 ›› Issue (6): 769-773.doi: 10.11743/ogg20080610

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Comprehensive evaluation of sealing ability of Tonggang fault in the Bachu uplift of the Tarim basin

Quan Yuke1,2, Ding Wenlong3, Yu Tengxiao4, Huang Taizhu4   

  1. 1. China University of Petroleam, Beijing 102249, China;
    2. China National Offshore Oil Co., Beijing 100010, China;
    3. Schoal of Energy Resoares, China University of Geosciences, Beijing 100083, China;
    4. Northwest Oilfield Company, SINOPEC, Urnmqi, Xingjiang 830011, China
  • Received:2008-06-10 Online:2008-12-24 Published:2012-01-16

Abstract:

Two structural traps (the Tonggang fault nose and the southern Tonggang faulted anticline) were developed in the Tonggang fault belt of the northwest Bachu uplift.The effectiveness of these traps,however,is still uncertain.The sealing ability of the Tongang fault has a direct effect on the effectiveness of the Tonggang structural traps.It is comprehensively evaluated through study of formation juxtaposition across,fault,surface mapping,shale smear factor,and calculation of pressure on fault surface.The following understandings are obtained. The lateral sealing ability is relatively low as a whole,while the vertical sealing ability is moderate to fair.Vertically,the seal is better in the deeper part (below the top of the Lower Ordovician) than that in the upper part; while laterally,it is better in the southern segment of the Tonggang fault than that in its northern segment.

Key words: seal evaluation, Tonggang fault, Bachu Uplift, Tarim Basin

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