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Salt tectonics in the western Kuqa Depression and its relation to oil and gas distribution

CHEN Shu-ping 1,2 TANG Liang-jie 1 JIA Cheng-zao 3 PI Xue-jun 4 XIE Hui-wen 4 (1.Key Laboratory for Hydrocarbon Accumulation of Education Ministry in the University of Petroleum,Beijing 102249,China; 2.Geological Research Institute of China Earthquake Bureau,Beijing 100029,China; 3.PetroChina Company,Ltd., Beijing 100011,China; 4.Tarim Oilfield Company,PetroChina Company,Ltd.,Kuerle 841000,China)  
According to the theories of fault-associated folds and salt tectonics,and based on the field work and seismic data interpretation for the western Kuqa Depression,the tectonic styles of the overburden,the salt sequence and the substrate,and their distribution,and formation mechanism were determined.The typical salt tectonic styles include salt cored anticlines,allochthonous salt,salt pillows,salt(fault) welds,salt necking,salt-associated depressions and "fish-tail"structures.The evolution of salt tectonics can be divided into two stages of early inceptive deformation (65~1.64 million years) and late compression deformation (about 1.64 million years).The two kinds of deformation,gravity sliding and layer-parallel compression in the early stage determined structural assemblages of the Kelasu tectonic belt.Deformation and tectonic styles in Qiulitake tectonic belt were caused by compression transmitted though the overburden detachment and were controlled by the thickness of salt layer and the crossed way of back thrust faults,respectively.The petroleum implication of the salt structures was discussed,and potential exploration areas were forecasted,based on some petroleum data.
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