南黄海北部盆地晚白垩世以来构造变形与盆地成因

南黄海盆地是中国近海的主要含油气盆地之一，油气勘探多年但成效不大。盆地结构不清、断裂体系多样与构造演化复杂的因素致使勘探潜力不明。为探讨南黄海北部盆地晚白垩世以来的构造变形特征与断陷盆地形成机理，通过近年最新二维地震资料解释及钻井等地质记录，结合相关地质背景和前人研究成果，对北部盆地的断裂特征和盆地结构开展综合研究，形成北部盆地晚白垩世以来不同时期断裂发育模式和地层沉积充填特征的认识。通过研究认为，中生界-古生界海相地层在印支期遭受挤压变形而形成逆冲断裂，该断裂系构成晚白垩世以来盆地的重要基底断裂系。在后期伸展应力状态下，基底断裂复活，控制着盆地内断层的活动范围和活动方式，同时控制着晚白垩世以来的地层沉积格局和构造样式，形成以伸展构造变形为主的多凹组成的断陷群，反映出“深层约束浅层”的关系。

Structural deformation and genesis of the northern sub-basin in South Yellow Sea since Late Cretaceous

South Yellow Sea Basin is one of the major petroliferous basins offshore China.It has been explored for years but with no significant commercial discovery due to a lack of understanding of its structure,diversified fault systems and complicated tectonic evolution.To evaluate the exploration potential and gain insight into faulting activities and sedimentation of the basin,we performed characterization of the tectonic deformation and formation mechanism analyses of the northern sub-basin in South Yellow Sea Basin since the Late Cretaceous based on a combination of the latest two-dimension seismic data with relevant geologic setting,drilling data and previous research papers.It shows that thrust faults were formed in the marine strata due to the compression and deformation the Indo-China period,and the fault system served as the basement faulting system since the Late Jurassic.It was later reactivated by extension and controlled the activities of faults within the basin as well as the sedimentary framework.A faulted depression cluster that was dominated by extensional structural deformation formed,reflecting a relationship of shallower strata being constrained by the deeper ones.