Structural Variation between the Western and Eastern Kuqa Fold-and-thrust Belt,China:Insights from Seismic Interpretation and Analog Modeling  

作　　者：WANG Wei XIE Huiwen YIN Hongwei JIA Dong XU Zhenping LUO Haoyu HE Wanhui YUAN Rui DUAN Yunjiang 

机构地区：[1]School of Earth Science and Engineering,Nanjing University,Nanjing 210046,China [2]Research Institute of Petroleum Exploration and Development,Tarim Oilfield Company,PetroChina,Korla,Xinjiang 841000,China

出　　处：《Acta Geologica Sinica(English Edition)》2023年第4期1078-1093,共16页地质学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.41572187,41972219,41927802 and 42072320);the China Postdoctoral Science Foundation(Grant No.2020M671432)。

摘　　要：The Kuqa fold-and-thrust belt exhibits apparent structural variation in the western and eastern zone.Two salt layer act as effective decollements and influence the varied deformation.In this study,detailed seismic interpretations and analog modeling are presented to construct the suprasalt and subsalt structures in the transfer zone of the middle Kuqa and investigate the influence of the two salt layers.The results reveal that the relationship of the two salt layers changes from separated to connected,and then overlapped toward the foreland in the transfer zone.Different structural models are formed in the suprasalt and subsalt units due to the interaction of the two salt layers.The imbricate thrust faults form two broom-like fault systems in the subsalt units.The suprasalt units develop detached folds terminating toward the east in the region near the orogenic belt.Whereas,two offset anticlines with different trends develop at the frontal edge of the lower salt layer and the trailing edge of the upper salt layer,respectively.According to exploration results in this region,the relationship between suprasalt and subsalt structures has an influence on hydrocarbon accumulation.We believe that the connected deformation contains high-risk plays while the decoupled deformation contains well-preserved plays.

关 键 词：along-strike variation analog modeling 3D geometric model salt-related structure Kuqa fold-and-thrust belt 

分 类 号：P542[天文地球—构造地质学] P631.4[天文地球—地质学]