准噶尔盆地莫索湾凸起西缘走滑断裂分层变形特征及形成机理  

Layered Deformation Characteristics, Formation Mechanism of Strike-slip Faults on the Western Margin of Mosuowan Uplift,Junggar Basin

作　　者：田安琦 陈石[1,2] 余一欣[1,2] 修金磊[3] 金峰 TIAN Anqi;CHEN Shi;YU Yixin;XIU Jinlei;JIN Feng(School of Geosciences,China University of Petroleum(Beijing),Beijing 102249,China;State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum(Beijing),Beijing 102249,China;Research Institute of Exploration and Development,Shengli Oilfield Company,SINOPEC,Dongying,Shandong 257000,China)

机构地区：[1]中国石油大学(北京)地球科学学院,北京102249 [2]中国石油大学(北京)油气资源与探测国家重点实验室,北京102249 [3]中国石化胜利油田分公司勘探开发研究院,山东东营257000

出　　处：《现代地质》2023年第2期296-306,共11页Geoscience

摘　　要：准噶尔盆地莫索湾凸起周缘地区发育大量走滑断裂,变形特征复杂,由于地震资料质量限制,断裂活动时间划分不一,形成机理不明。以莫索湾凸起西缘征沙村地区走滑断裂为研究对象,对征沙村地区走滑断裂的几何学形态及运动学特征展开研究。结果表明:征沙村走滑断裂分层差异变形,主要分为3层。深构造层二叠系发育近SN向和近WE向两组走滑断裂,WE向断裂近SN左行错断,剖面以负花状构造样式为主。中构造层三叠系—侏罗系八道湾组仅发育近WE向断裂,平面上形成马尾状、平形状以及叠接状构造样式,剖面表现正花状构造样式。浅构造层侏罗系三工河组断裂走向为近WE向,平面上呈线性展布,剖面以挠曲变形为主。3构造层断裂叠合发育,形成直立线状、Y形以及花状构造样式,其中近SN向断裂发生右行走滑,近WE向断裂发生左行走滑。将征沙村断裂演化期次分为3期:晚二叠世准噶尔地块逆时针旋转,形成近SN向走滑断裂,表现为负花状构造;早侏罗世天山NE—SW向挤压应力形成近WE向走滑断裂,表现为正花状构造;晚侏罗世极少数近WE向断裂继承发育。Many strike-slip faults are developed around the Mosuowan uplift in Junggar basin,with complex deformation characteristics.Due to the limit seismic data quality,the time division of fault activity is different,with the formation mechanism unknown.Taking the Zhengshacun area on the western margin of Mosuowan uplift as an example,we studied the geometric morphology and kinematic characteristics of strike-slip faults at Zhengshacun.The results show that the strike-slip faults at Zhengshacun have layered differential deformation,which is mainly divided into three layers.The deep structural layer is Permian,which develops two strike-slip fault groups in near N-S and near E-W directions.The E-W-trending faults cut the nearly N-S sinistral faults,and the section is mainly in negative flower structure style.The middle structural layer of Triassic-Jurassic Badaowan Formation only developed near E-W trending faults,forming horsetail,flat and overlapping structural styles on the plane,and the section developed positive flower structure.The fault strike of Jurassic Sangonghe Formation in the shallow structural layer is near E-W directed,which is linearly distributed on the plane,and the section is dominated by flexural deformation.The faults in the three structural layers are superimposed and developed to form vertical linear,Y-shaped and flower-shaped structural styles,in which the near N-S directed faults are dextral strike-slip and the near E-W directed ones are sinistral strike-slip.Evolution of the Zhengshacun fault are divided into three stages.In the Late Permian,the Junggar block rotates counterclockwise to form a near N-S strike-slip fault,showing a negative flower structure.In the early Jurassic,the NE-SW compressive stress of Tianshan formed a near E-W strike-slip fault,showing a positive flower structure.In the Late Jurassic,a few near E-W faults are inherited and developed.

关 键 词：准噶尔盆地 走滑断裂 活动期次 分层变形 形成机理 

分 类 号：P542[天文地球—构造地质学]