准噶尔盆地南缘玛纳斯背斜的构造分析与构造建模

发布时间：2018-07-27 17:56

【摘要】：玛纳斯背斜位于准噶尔盆地南缘山前第二排构造带,是三排构造带中变形最强烈的,地表出露了典型的断层相关褶皱现象。本文从过玛纳斯背斜地震剖面的构造分析入手,通过运用断层相关褶皱的构造几何分析方法,以地表、钻井数据、相邻地震剖面的对比为约束,建立与实际剖面相吻合的构造几何模型,并通过正演平衡地质剖面制作,再现玛纳斯背斜几何变形的运动学过程。分析表明玛纳斯背斜为三个构造三角楔的叠加变形,构造三角楔底、顶逆冲断层均派生次级反向逆冲断层,与对应的主断层形成突发构造变形样式。从垂向上看,玛纳斯背斜由下至上可划分为三套构造形变层:下部构造形变层—来自于深部的滑脱面(J2x以下)形成的低幅度断层转折褶皱;中部构造形变层—由胜金口组(K1sh)底部滑脱面控制的反向逆冲断层与底部逆冲断层形成的多级构造三角楔的叠加构造;上部构造形变层—由安集海河组(E2-3a)滑脱面控制的浅部大规模逆冲推覆构造。
[Abstract]:Manas anticline is located in the second row of tectonic belt in front of the south margin of Junggar basin. This paper begins with the structural analysis of the seismic section passing through the Manas anticline, by using the structural geometry analysis method of fault related folds, taking the comparison of surface, drilling data and adjacent seismic profiles as the constraint. A structural geometric model consistent with the actual section is established and the kinematic process of the geometric deformation of the Manas anticline is reproduced by making the forward balanced geological section. The analysis shows that the Manas anticline is a superimposed deformation of three structural triangular wedges, the bottom of the tectonic triangle wedge and the top thrust fault are derived from the secondary reverse thrust faults, and the corresponding main faults form a sudden structural deformation pattern. From the vertical point of view, the Manas anticline can be divided into three sets of tectonic deformation layers from the bottom to the top: the lower tectonic deformation layer-the low-amplitude fault-turning fold formed from the deep slip surface (below J2x); The central tectonic deformation-the superimposed structure of the multi-stage tectonic triangle wedge formed by the reverse thrust fault controlled by the bottom slip surface of the Shengjinkou formation (K1sh) and the bottom thrust fault; The upper tectonic deformation-a large scale shallow thrust nappe structure controlled by the slip surface of the Anji Haihe formation (E2-3a).
【作者单位】：中国地质大学能源学院;海相储层演化与油气富集机理教育部重点实验室中国地质大学;
【基金】：国家自然科学基金面上项目(41372139,41072098) 国家科技重大专项(2011ZX05018-001-002,2016ZX05046-003-001)
【分类号】：P548;P618.13

【相似文献】