北黄海盆地构造几何学研究新进展

Research Progress on Structural Geometry of the North Yellow Sea Basin

北黄海盆地是发育于隆起背景之上的中、新生代沉积盆地。新一轮资源调查研究表明,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下构造层(J_3—K_1)、中构造层(E_2—E_3)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-刘公岛隆起区等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、局部伴生型和披盖型等三类,断裂构造主要可见近EW—NE向、NW向和NNE向三组,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。

The north Yellow Sea basin is a Meso-Cenozoic sedimentary basin developed on the regional upwarping setting. The new round of resources survey reveals that the basement of the north Yellow Sea Meso-Cenozoic basin consists of Paleozoic sedimentary rocks and Presinian metamorphic rocks, and the basin develops differently lower（J3-K1）, medium （E2-E3）and upper （N）struetural layers. From the point of view of oil ＆ gas resources and Meso-Cenozoie strata, the north Yellow Sea area can be divided into such 3 first-class structural units as Liaodong-haiyangdao upwelling area, north Yellow Sea basin and jiabei-liugongdao upwelling area, and the north Yellow Sea basin includes 6 second-class structural units and 24 third-class structural units. The folds and faults develop very much in the basin, and the former can be divided into 3 genetic types -- regional compressive fold, local associated fold and drape-like fold, and the latter mainly shows 3 directions -- near EW-NE, NW and NNE, in which the near EW-NE and NNE faults are well-developed relatively and control the distribution framework and sedimentary features of uplift and depression.