地质科学2024，Vol.59Issue(4)：1082-1097,16.DOI:10.12017/dzkx.2024.077
库车坳陷西部阿瓦特—博孜地区构造变形差异及数值模拟分析
Structural deformation differences and numerical simulation analysis of Awate-Bozi area in the western Kuqa Depression
摘要
Abstract
The Awate-Bozi area in the western Kuqa Depression is located in a tectonic transition zone of compression,where the structural deformation varies significantly along the strike.Based on the latest three-dimensional seismic data and discrete element numerical simulation method,this paper presents a detailed geological modeling of the region,simulates its formation and evolution processes,and discusses the controlling factors of differential deformation.In the Awate area,subsalt thrusting occurs along the Keshen fault over a long distance,forming two sets of overlying thrust systems,both of which detach along the Jurassic coal seam;the Awate sag with relatively small thickness develops above the salt;the salt structures are mainly uncomformity-type.In the Bozi area,subsalt deformation north of the Keshen fault is characterized by basement-involve deformation,while to the south it manifests as detachment along the coal seam,with the overall structure being a wedge-shaped imbricate thrust system;the Baicheng sag with huge thickness develops above the salt;the salt structures are mainly comformity-type.The simulation results show that the Wensu paleo-uplift is the main cause of differential deformation in Awate-Bozi area,which restricts the sedimentary range from Mesozoic to Paleogene and impedes the forward transfer of deformation.Pre-existing salt diapir and the differential compression of the southern Tianshan also play a certain role in controlling the deformation in the region.The evolutionary process based on seismic profiles and numerical simulation results suggests the region's tectonic activity has a trend of intensifying from weak to strong:tectonic deformation began during the deposition of the Jidike Formation in the Early Miocene,followed by a significant tectonic acceleration event after the deposition of the Kangcun Formation in the Early Pliocene.关键词
库车坳陷西部/构造建模/离散元数值模拟/古隆起/差异变形/盐底辟Key words
Western Kuqa Depression/Geological modeling/Discrete element method/Paleo-high/Differential deformation/Salt diapir分类
天文与地球科学引用本文复制引用
谢会文,陈龙,吴超,陈汉林,顾成龙,程晓敢..库车坳陷西部阿瓦特—博孜地区构造变形差异及数值模拟分析[J].地质科学,2024,59(4):1082-1097,16.基金项目
国家自然科学联合基金项目(编号:U22B6002)和超深研发中心和超深层碎屑岩重大专项(编号:2023ZZ14YJ02)资助 （编号:U22B6002）
