营潍断裂带结构特征及其与相邻盆地的关系

THE STRUCTURAL CHARACTERISTICS OF THE YINWEI FAULT ZONE AND ITS RELATIONSHIP WITH THE ADJACENT BASINS

营滩断裂带是渤海湾盆地东部重要的边界条件,对油气地质条件具有重要影响。依据大量实际地震资料,将营潍断裂带划分为三段,即潍坊-莱州湾-黄河口段、渤东低凸起段和辽东凸起段,各段在断裂走向、结构及组成等方面具有较大的差异。结合区域应力分析和新生代盆地盖层构造变形特征,认为营潍断裂带在新生代的活动具有明显的差异性,以伸展、右旋走滑活动为主,大致可分为三个时期,即古新世-早始新世、中始新世-渐新世、新近纪-第四纪。在此基础上,探讨了营潍断裂带与相邻新生代盆地的关系,并根据结构样式将相邻盆地划分为五种类型。

The Yinwei fault zone is one of the most important boundary conditions in the eastern Bohai Bay Basin, which has significant influence on petroleum geology condition of the adjacent basins. Based on the analysis of geological and geophysical data, we devided the Yinwei fault zone into three segments, i.e. Weifang-Laizhouwan- Huanghekou segment, Bodong low uplift segment and Liaodong uplift segment. Each segment has great differences in strike, structural features and the width of fault zone. Meanwhile, combined with regional tectonic stress field and structural deformation analysis on the cenozoic sedimentary cap, the Yinwei fault zone shows obvious differences in active period and active pattern. The fault zone are characterized by dextral strike-slip extension movement in cenozoic, and experirenced three active stages, i.e. Paleocene-early Eocene, middle Eocene- Oligocene, and Neogene-Quaternary. On the basis of the comprehensive analysis, the relationship of tectonic evolution between the Yin-wei fault zone and its adjacent basins was discussed in this paper in detail, and the adjacent basins were devided into five types according to structural styles of the basins.