塔里木盆地顺北地区13号走滑断裂带发育特征  

Structural Geometry and Evolution of the No.13 Strike-slip Fault Zone in the Shunbei Area,Tarim Basin

作　　者：金峰 朱秀香[4] 余一欣[1,2] 陈绪云[4] 陈石[1,2] 梁鑫鑫 余浪 JIN Feng;ZHU Xiuxiang;YU Yixin;CHEN Xuyun;CHEN Shi;LIANG Xinxin;YU Lang(State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum,Beijing 102249,China;Basin and Reservoir Research Center,China University of Petroleum,Beijing 102249,China;Hainan Branch,CNOOC China Limited,Haikou 570100,Hainan,China;Sinopec Northwest Oilfield Company,Urumqi 830011,Xinjiang,China)

机构地区：[1]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 [2]中国石油大学(北京)地球科学学院,北京102249 [3]中海石油(中国)有限公司海南分公司,海南海口570100 [4]中国石化西北油田分公司,新疆乌鲁木齐830011

出　　处：《大地构造与成矿学》2023年第1期54-65,共12页Geotectonica et Metallogenia

基　　金：国家重点研发计划项目(2017YFC0603105);国家自然科学基金项目(42072149)联合资助。

摘　　要：塔里木盆地顺北地区走滑断裂带属于典型的克拉通内走滑断裂,而且与油气成藏关系密切。本文基于三维地震资料解释成果,对顺北13号走滑断裂带的变形特征、活动期次、活动强度进行分析,并结合区域构造应力场探讨其形成机制。顺北13号走滑断裂带整体呈NNW走向,可识别长度超过100 km,具有“平面分段、纵向分层、多期发育”的特点。断裂带在深层主要发育压扭构造,北段以挤压为主,南段以平移为主;在浅层主要表现为右阶斜列边界断裂控制的双断或多断地堑。顺北13号走滑断裂带主要在加里东中期(晚奥陶世)和海西晚期(中-晚二叠世)发生较强烈的活动,在加里东晚期(志留纪)也发生弱活动,断裂带活动性整体由北向南减弱,运动学标志显示其为一条右旋走滑断层。顺北13号走滑断裂带的发育过程主要受控于塔里木盆地北缘天山洋的多期俯冲挤压而产生的自北向南的主压应力,断裂带自北向南发生扩展延伸,与顺北5号走滑断裂带北段具有一定相似性。The strike-slip fault zone in the Shunbei area of the Tarim Basin is of typical intracratonic,which is closely related to hydrocarbon accumulation.In this paper,the geometrical deformation characteristics,active periods and active intensities of the No.13 strike-slip fault zone are analyzed based on the interpretations of 3D seismic data,and its formation mechanism is further clarified.The No.13 strike-slip fault zone extends to NNW for more than 100 km,which is characterized by“plane segment,layered deformation and multi-stage activities”.The fault at the deep layer is mainly dominated by the transpression in the north part and translation in the south part.In the shallow layer,the boundary faults have right-step en echelon shape,which form double or multi-fault grabens.The No.13 strike-slip fault zone underwent multiple active stages,and the main part experienced two stages—the Middle Caledonian(the Late Ordovician)and the Late Hercynian(the Middle to Late Permian),while some parts were weakly activated in the Late Caledonian(Silurian).The activity of the fault zone weakened from north to south,and the kinematics indicated that it was a dextral strike-slip fault.The development process of the No.13 strike-slip fault zone is mainly controlled by the main compressive stress from north to south generated by the multi-stage subduction and compression of the Tianshan Ocean in the northern margin of the Tarim Basin,and the fault zone extends from north to south,which is similar to the northern segment of the No.5 strike-slip fault zone.

关 键 词：走滑断裂 分段性 活动性 形成机制 顺北 塔里木盆地 

分 类 号：P542[天文地球—构造地质学]