海拉尔—塔木查格盆地为一中、新生代裂陷盆地，受后期构造作用强烈影响，盆地结构及演化过程十分复杂，基础地质研究进展较慢，严重阻碍了油气勘探进程。本文以南贝尔凹陷的三维地震资料为基础，在系统解释三维地震资料基础上，对工区进行构造解析，查明凹陷结构特征，总结构造演化规律，分析构造形成机制，将南贝尔凹陷构造样式划分为铺展、收缩和走滑3类，进而识别出中生代以来构造演化分为初始裂陷期、强烈断陷期、挤压反转期、张扭沉降期、扭压反转期5个阶段，研究结果对加强南贝尔凹陷乃至整个海拉尔—塔木查格盆地的地质认识、加快南贝尔凹陷的油气勘探进程有重要意义。
Because Hailar-Tamtsag Basin is a Mesozoic-Cenozoic rift basin, and developed on the basis of Tianshan-Xing'an Variscan orogenic system. And Hailar-Tamtsag Basin was strongly influenced by the late tectonism, the architecture of the basin and its evolution is very complicated, the advances in fundamental geological researches are slow, and seriously impede the progress of oil and gas exploration. Based on the 3D seismic data of Nanbeier Sag, a structural analysis for the working block is conducted, the architecture characteristic of the sag is found out, the regularity of the tectonic evolution is summarized, and the tectonic formation mechanism is analyzed on the basis of the system interpretation of 3D seismic data. And the structural styles of Nanbeier depression can be divided into five groups, that is, weakly rifting stage, intensely rifting stage, reversely compressing stage, transtensional depression stage, and transpressional depression stage. It has an important significance for the geologic understanding of Nanbeier sag and even the whole Hailar-Tamtsag Basin, and accelerates the oil and gas exploration process of Nanbeier sag.
