南贝尔凹陷东次凹构造特征与构造演化

南贝尔凹陷位于海拉尔-塔木察格盆地断陷带的中部,是塔木察格盆地的次级构造单元,也是海-塔盆地最具勘探潜力的凹陷之一,东次凹是南贝尔凹陷的三个次级构造单元中的一个。通过对研究区构造特征的分析,将研究区划分成六个三级构造单元:南部由西向东可划分为西部断鼻带、南部洼槽带和东部断阶带;其北部自西向东依次可划分为北部洼槽带、中央隆起带和断裂构造带。在此基础上认识了南贝尔凹陷东次凹构造演化阶段及构造变形,这有助于揭示凹陷演化规律,分析构造演化对油气成藏条件的影响,同时对加快南贝尔凹陷的油气勘探进程有重要意义。

Structural characteristics and tectonic evolution of east concave in Bell south depression

South Buir Sag is located in the central part of the rift belt in Hailar - Tamsag basin. It is the secondary unit in Tamsag basin, and it is also one of the most prospective sags in Hailar - Tamsag basin. The East sub - sag is one of the three secondary structural units in South Buirsag. Through analyzing the structural characteristics in the study area, the area can be divided into 6 tertiary structural units. I.e. the southern part from west to east can be divided into West fault- nose belt, South trough belt and east fault terrace belt; the northern part, from west to east, can be divided into north trough belt, central uplift belt and faulted structure belt. On this basis, the tectonic evolution stages and structural deformation occurring in the East sub - sag of South Bair Sag have been realized. This would be conduction to revealing the evolution pattern of the sag, analyzing the influence of tectonic evolution on the oil and gas reservoiring condition ; besides, this would be of great significance to fastening the progress of petroleum exploration in South Buir Sag.