Oil & Gas Geology ›› 2011, Vol. 32 ›› Issue (5): 768-776.doi: 10.11743/ogg20110516

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Structural features of post-salt layers in the middle sedimentary cover of Kuqa Depression,the Tarim Basin

Xie Huiwen1, Li Yong1, Guo Weixing2,3, Wu Chao1, Xu Zhenping1, Qi Jiafu2   

  1. 1. Research Institute of Exploration and Development,PetroChina Tarim Oilfield Company,Korla,Xinjiang 841000,China;
    2. College of Geosciences,China University of Petroleum,Beijing 102249,China;
    3. SINOPEC Southwest Oilfield Company,Chengdu,Sichuan 610086,China
  • Received:2011-07-03 Online:2011-10-28 Published:2011-12-16

Abstract:

The thick salt layer of Kumgeliem Group(E1-2km)at the bottom of Cenozoic led to the complicated deformation of post-salt layers in Kuqa Depression.Structural deformation in the study area is studied based on interpretation of seismic data.The types of structural deformation were identified,i.e. contractional structure and salt diapir-related structure.The contrational structures can be divided into thin-skinned folds and thrusts,with salt layer as the detachment.The salt diapir-related structures can be divided into blind piercing diapir structure and piercing diapir structure,which were caused by local thickening and piercing due to salt along-bed flow.The salt diapire-related structures started to develop during the deposition of Jidik Formation(N1j)and experienced two evolution stages.The first stage was the Miocene when salt diapir-related was mainly caused by the differential pressure of the overlying strata, while the second stage was the Pliocene and Quaternary when salt diapir-related diaper was mainly caused by horizontal depression.The contractional structures were mainly formed during the deposition of Kuqa Formation(N2k)and Xiyu Formation(Q1x),with deformation of decollement folds and development of thrusts on the limbs of folds.

Key words: salt structure, post-salt layer, contractional structure, structural style, structural evolution, Kuqa Depression, Tarim Basin

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