北黄海盆地地质构造特征及其演化

北黄海地区是我国研究程度最低的海区，各种情况表明，本区油气前景乐观。为了弄清北黄海盆地地质构造特征及其演化，在前人研究成果基础上，对北黄海盆地原有二维地震资料和重磁资料进行了重新处理和解释。资料处理采用了地震多次波压制技术、精细速度谱分析、位场延拓、小波多尺度分析、区域场和剩余场分解、方向导数分析以及重震联合反演等多种处理技术，对地球物理资料进行了综合解释。北黄海盆地结晶基底北低南高。褶皱基底呈NE向格局，埋深起伏变化较大。盆地主要发育NE向和NW向两组断裂。盆地被两条NE向的边界断裂所控制。NW向断裂是盆地内的次级断裂，控制了盆地内坳陷和隆起的分布范围和形态，使北黄海盆地形成三坳两隆的构造体系。规模较小的NE向3级断裂分布在坳陷内部，将坳陷分为不同规模的局部凹陷和局部隆起。火成岩主要分布在西部隆起带的南端和南部隆起带上，火成岩对坳陷内部影响不大。

The Structural Features of North Yellow Sea Basin and Its Evolution

The North Yellow Sea Basin is an oceanic area we studied little. However, it is optimistic to find oil and gas reservoirs in this area according to different information. We reprocessed and reinterpreted 2D seismic data as well as gravity and magnetic data of this area, standing on the former researchers' shoulder, for the purpose of studying the tectonic features and its evolution further. We implemented a lot of methods such as multiple attenuation, fine velocity spectrum analysis, continuation of potential field, multi-scale analysis, separation of region and residual field, directional derivative analysis, joint inversion of seismic and gravity etc. to make sure the results be more reliable. After integrated interpretation, we got some meaningful results. The crystallized basement is higher in the north and lower in the south. The fold basement that is rolling is in NE direction. There are two sets of fractures one of which is in NE direction and the other is in NW direction in the basin. There are two NE directional fractures located in the north and south separately that become the basin's margin.