塔里木盆地库车坳陷中段盐上层构造特征

doi:10.11743/ogg20110516

Abstract

Abstract:

The thick salt layer of Kumgeliem Group(E_1-2km)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

CLC Number:

TE121.2

Xie Huiwen, Li Yong, Guo Weixing, Wu Chao, Xu Zhenping, Qi Jiafu. Structural features of post-salt layers in the middle sedimentary cover of Kuqa Depression,the Tarim Basin[J]. Oil & Gas Geology, 2011, 32(5): 768-776.

References

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

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