准噶尔盆地南缘中段构造变形特征及次级分段划分  

Deformation characteristics and sub-segment division of structural zone in the middle part of the southern margin in Junggar Basin

作　　者：姜颜良 孙文洁 崔立杰 杜彦男 李孙义 孔雪 吴孔友[3] JIANG Yanliang;SUN Wenjie;CUI Lijie;DU Yannan;LI Sunyi;KONG Xue;WU Kongyou(Geophysical Research Institute Co.,Ltd.,SINOPEC,Nanjing 211103,China;China University of Petroleum(Beijing)at Karamay,Karamay 834000,China;School of Geoscience,China University of Petroleum,Qingdao 266580,China;Shandong Institute of Petroleum and Chemical Technology,Dongying 257000,China)

机构地区：[1]中石化石油物探技术研究院有限公司,江苏南京211103 [2]中国石油大学(北京)克拉玛依校区,新疆克拉玛依834000 [3]中国石油大学(华东)地球科学与技术学院,山东青岛266580 [4]山东石油化工学院,山东东营257000

出　　处：《断块油气田》2023年第5期779-789,共11页Fault-Block Oil & Gas Field

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);国家科技重大专项专题“地层圈闭描述及有效性分析技术研究”(2017ZX05001003-004);山东省自然科学基金青年基金项目“起伏地表黏弹各向异性介质正演模拟研究”(ZR2020QD051)。

摘　　要：文中对准噶尔盆地南缘中段最新采集处理的地震剖面进行精细的沉积-构造解释,应用断层相关褶皱理论和断层滑移距离定量分析方法,探讨研究区复杂叠加构造变形特征及差异性,结合挤压域构造变换带的分布及构造变形差异对南缘中段进行了次级分段划分。研究认为:1)南缘中段背斜构造受基底卷入型断裂体系和顺层滑脱型断裂体系联合控制,各种构造相互叠加形成多种类型的复合构造样式;构造变形程度自南向北、自东向西逐渐减弱;断层滑移距离“由深至浅”逐渐变小,主干断层滑移距离变化存在明显拐点,表明断层发育的多期次性和继承性。2)南缘中段发育纵向和横向2种性质的构造变换带,纵向变换带主要发育在盖层滑脱型褶皱-冲断带内相邻背斜的过渡区域,横向构造变换带主要发育在盆-山交界处,多以走滑断层的形式调节两侧的构造变形差异。3)结合构造变换带分布和不同区带的构造变形差异,将南缘中段精细划分为Ⅰ-1段、Ⅰ-2段、Ⅱ-1段、Ⅱ-2段、Ⅲ段。构造分段及变形特征的明确,对理解研究区油气成藏条件和指导油气勘探具有重要意义。Detailed sedimentary-structural interpretation of the latest seismic profiles collected and processed in the middle part of the southern margin in Junggar Basin is carried out.Fault-related fold theory and quantitative analysis method of fault slip distance are used to explore the deformation characteristics and differences of complex superimposed structures in the study area.Combined with the distribution of structural transformation zone in the extrusion domain and the difference of structure deformation,the middle part of the southern margin is divided into several sub-segments.The results show that:(1)The anticline structure in the middle part of the southern margin is jointly controlled by the basement-involved and bedding-slip fault systems,and various structures are superimposed to form various types of composite structural styles;the degree of structural deformation gradually weakened from south to north and from east to west;the fault slip distance decreases gradually from deep to shallow,and the change curve of main fault slip distance has obvious inflection point,which indicates the multi-stage and inheritance of fault development.(2)There are longitudinal and transverse structural transformation zones in the middle part of the southern margin.The longitudinal transformation zone is mainly developed in the transition area of adjacent anticlines in the cap rock slip-fold thrust belt,and the transverse structural transformation zone is mainly developed at the basin-mountain junction,which regulates the structural deformation differences on both sides in the form of strike-slip faults.(3)Combined with the distribution of structural transformation zone and the difference of structural deformation in different zones,the middle part of the southern margin is finely divided intoⅠ-1,Ⅰ-2,Ⅱ-1,Ⅱ-2,Ⅲsegments.The segment division of structural zone and deformation characteristics is of great significance for understanding the hydrocarbon accumulation conditions in the study area and guiding oil and gas ex

关 键 词：构造样式 构造变形 构造变换带 构造分段 准噶尔盆地南缘中段 

分 类 号：TE121[石油与天然气工程—油气勘探]