北黄海盆地构造几何学研究新进展

北黄海盆地是发育于胶辽隆起背景之上的中、新生代沉积盆地。研究表明,北黄海中、新生代沉积盆地的基底由古生界沉积岩层和前寒武纪变质岩系等组成,盆地不同程度地发育于中新生代下构造层(J₃-K₁)、中构造层(E₂-E₃)和上构造层(N).从油气资源和中、新生代地层发育情况出发,将北黄海海域划分为辽东-海洋岛隆起区、北黄海盆地和胶北-刘公岛隆起区3个一级构造单元。其中北黄海盆地包括6个二级构造单元和24个三级构造单元;盆地内褶皱、断裂构造十分发育,褶皱构造可划分为区域挤压型、局部伴生型和披覆型3类,断裂构造主要可见近EW-NE向、NW向和NNE向3组,其中近EW-NE向和NNE向断裂比较发育,控制着盆地隆、坳分布格局和沉积特征。 

NEW PROGRESS IN THE STUDY OF TECTONIC GEOMETRY OF THE NORTH YELLOW SEA BASIN

The North Yellow Sea basin is a Meso-Cenozoic sedimentary basin developed in the setting of the Jiaoliao uplift.Study indicates that the basement of the Meso-Cenozoic North Yellow Sea basin consists of Paleozoic sedimentary rocks and Precambrian metamorphic rocks,and that the basin is developed to different degrees in the lower(J_3-K_1),middle(E_2-E_3)and upper(N)tectonic layers.Based on petroleum resources and Meso-Cenozoic strata,the North Yellow Sea region may be divided into three first-order tectonic units,namely,the Liaodong-Haiyangdao uplift area,North Yellow Sea basin and Jiabei-Liugongdao uplift area.Of these tectonic units,the North Yellow Sea basin includes six second-order tectonic units and 24 third-order tectonic units.Folds and faults are very well developed in the basin.The former may be divided into regional compressive folds,local associated folds and drape-like folds,and the latter mainly includes the nearly EW-NE set,NW set and NNE set,of which the nearly EW-NE and NNE sets of faults are better developed and control the distribution pattern of uplift and depression and sedimentary features.