摘要
准噶尔盆地南缘中段紧邻北天山山前,构造变形错综复杂。山前发育的三排构造的形成时间存在许多认识上的分歧,对演化过程中褶皱和断裂的变形叠加特征缺少系统的对比分析。笔者在前人研究的基础上,利用地震资料解释、平衡剖面恢复、构造物理模拟等研究手段,结合断层滑移距、伸展压缩速率定量分析方法,对研究区的构造变形特征和叠加演化过程进行了系统的分析。研究认为:(1)南缘中段三排构造自南向北,变形强度由强变弱;第一排背斜受控于基底卷入型断裂体系,第二、三排背斜受控于顺层滑脱型断裂体系,构造之间具有形成递进的演化关系,叠加形成多种复合构造样式。(2)断层滑移距总体“由深至浅”逐渐变小,具有继承性发育的特点;主干断裂滑移距存在明显的拐点,是多期次活动的有力证据。(3)基底大型逆冲断裂是先存断裂,后期继承性发育;基底卷入型褶皱-冲断带是褶皱作用发生在逆冲断裂之前,后期表现出边断边褶特征;滑脱型褶皱-冲断带是冲断和褶皱同时或冲断先于褶皱形成。(4)第一排背斜形成于侏罗纪末期,第二排背斜在此时期形成微弱雏形,并在古近纪末期形成明显轮廓;第三排背斜形成于新近纪末期;第四纪至今的强大挤压作用使3排背斜被断裂强烈改造。
The middle part of the southern margin of the Junggar Basin is adjacent to the North Tianshan Mountain Front,and the tectonic deformation is intricate and complex.There are many differences in the understanding of the formation time of the three rows of structures developed in the mountain front,and there is a lack of systematic comparative analysis of the deformation superposition characteristics of folds and fractures during the evolution.In this paper,on the basis of previous studies,the research tools such as seismic data interpretation and equilibrium profile recovery are used,combined with the quantitative analysis methods of fault slip distance and extensional compressional rate,to make a systematic analysis of the tectonic deformation characteristics and superposition evolution process in the study area.The study concludes that:①The three rows of structures in the middle section of the southern margin from south to north,the deformation intensity from strong to weak;the first−row anticlines are controlled by the basement−involved fault system,and the second−row and third−row anticlines are controlled by the bedding−decollement fault system.There is a progressive evolution relationship between the structures,and a variety of composite structural styles are superimposed.②The fault slip distance gradually decreases from deep to shallow,with the characteristics of inheritance development;there is an obvious inflection point in the slip distance of the main fracture,which is a strong evidence of multi−stage activity.③The basement large−scale thrust fault is a pre−existing fault,and later inherited development;the basement−involved fold−thrust belt is characterized by fold while fault in the later period when fold occurs before thrust fault;the detachment fold−thrust belt is formed by thrust and fold at the same time or thrust before fold.④The first row of anticlines formed in the late Jurassic,and the second row of anticlines formed a weak prototype in this period,and formed a cle
作者
郭文建
姜颜良
卞保力
袁波
张学才
吴孔友
孙文洁
李天然
GUO Wenjian;JIANG Yanliang;BIAN Baoli;YUAN Bo;ZHANG Xuecai;WU Kongyou;SUN Wenjie;LI Tianran(Research Institute of Exploration and Development,Xinjiang Oilfield Company,PetroChina,Karamay 834000,Xinjiang,China;Sinopec Geophysical Research Institute,Nanjing 211103,Jiangsu,China;Shengli Oilfield Company,SINOPEC,Dongying 257000,Shandong,China;School of Geosciences,China University of Petroleum(East China),Qingdao 266580,Shandong,China)
出处
《西北地质》
CAS
CSCD
北大核心
2023年第4期62-74,共13页
Northwestern Geology
基金
中国科学院先导科技A类专项“深层油气形成与分布预测”(XDA14010301)
国家科技重大专项“地层圈闭描述及有效性分析技术研究”(2017ZX05001003-004)联合资助。
关键词
构造样式
变形特征
断层滑移距
构造演化
构造物理模拟
准噶尔盆地南缘中段
ftructure style
deformation characteristics
fault slip distance
structural evolution
structural physical simulation
middle section of southern margin of Junggar basin
