塔里木盆地顺南地区走滑断裂发育特征及演化  

DEVELOPMENT AND EVOLUTION OF THE STRIKE-SLIP FAULTS IN SHUNNAN AREA,TARIM BASIN

作　　者：孔永吉 吴孔友[1] 刘寅[1] KONG Yong-ji;WU Kong-you;LIU Yin(School of Geosciences and Technology,China University of Petroleum,Qingdao 266580,Shandong Province,China)

机构地区：[1]中国石油大学(华东)地球科学与技术学院,山东青岛266580

出　　处：《地质与资源》2020年第5期446-453,共8页Geology and Resources

基　　金：中科院先导科技A类专项“深层油气形成与分布预测”(XDA14010301);国家科技重大专项(2017ZX05001003-004).

摘　　要：顺南地区位于塔里木盆地塔中隆起北部.受多期构造应力影响,该地区以走滑断裂大量发育为典型特征.对三维地震资料的精细解释和深入分析结果表明,研究区走滑断裂具有垂向分层、平面分段、多期次构造叠加的特征.顺南地区主要发育北东、北东东和北西向3组走滑断裂.北东向断裂活动性强,平面上发育雁列式断层及马尾状构造,剖面上主要发育对称花状、正花状与负花状上下分层叠置的复合花状构造.北东东和北西向断裂活动性较弱,剖面上以单条直立走滑断裂为主,平面上呈线性延伸或由多段同向走滑断层连接而成.根据断层构造样式和受力性质,将顺南1断裂沿走向划分为4段:2个复合花状-拉张段和2个简单花状-挤压段,拉张段和挤压段沿走向交替出现.顺南走滑断裂的形成主要经历了5期构造运动:加里东早期、加里东中期Ⅰ幕、加里东中期Ⅲ幕、加里东晚期—海西早期和海西晚期.其中,加里东中期Ⅰ幕和加里东中期Ⅲ幕为该区主要断层活动期.Shunnan area,located in the northern Tazhong uplift of Tarim Basin,is affected by multi-stage tectonic stress with a large number of developed strike-slip faults.Detailed interpretation and deep analysis of 3D seismic data show the faults are varied in vertical and plane views with multi-stage structural superposition.There are mainly 3 groups,i.e.NE,NEE,and NW,of strike-slip faults developed in the study area.The NE-trending faults are highly active,with en echelon and horsetail structures developed on the plane,and composite flower structures of symmetric flower,positive and negative flowers superimposed on the profile;while the NEE and NW faults are less active,with single vertical strike-slip fault dominated on the profile,and linear extension or multi-section synthetic strike-slip faults connected on the plane.According to the structural style and stress property,the FSN1 can be divided into 4 segments along the strike,including 2 composite flower-tensional segments and 2 simple flower-compressional segments,which occur alternately along the strike.The strike-slip faults mainly went through 5 stages of tectonic movements:the Early Caledonian,Episode I of Middle Caledonian,Episode III of Middle Caledonian,Late Caledonian-Early Hercynian and Late Hercynian,among which,the second and third are the main stages for fault activity.

关 键 词：走滑断裂 构造演化 花状构造 三维地震解释 塔里木盆地 

分 类 号：P542.3[天文地球—构造地质学]