郯庐断裂渤南段各分支新生代构造特征及其对油气聚集的控制作用

通过对郯庐断裂渤南段3 个分支几何构造样式、断裂活动速率和伸展量、优势伸展方向等运动学特征，以及构造演化特征等方面的对比分析，总结了与之对应的斜向伸展-弱走滑改造、斜向伸展-强走滑叠加、持续强走滑拉分3 种构造成因类型，并阐明了不同成因演化模式对圈闭形成、储层发育和油气运移的控制作用，建立了各分支构造-成藏响应关系。结果表明，新生代以来渤海南部海域处于地幔隆升导致的南北向引张和太平洋板块斜向俯冲形成的北东向右旋剪切双重应力场中，郯庐断裂的3 个分支具有相同的构造演化阶段，但各个时期局部应力场的不同导致了它们构造特征的差异，进而影响和控制了各分支在油气聚集时期、层位、规模等方面的成藏差异性。

Structural characteristics of the various branches of Bonan segment,Tanlu fault belt and their controlling effects of hydrocarbon accumulation

Through systematic comparative study on the kinematic characteristics of the three branches of Boban segment, Tan-Lu fault belt, such as geometry structure style, fault activity rate, amount of extension, the advantage of the extension direction, and comparative analysis of tectonic evolution characteristics based on balanced cross-section restoration, this paper summed up the three corresponding structural genetic models, which are oblique stretch-weak strike slip reformed, oblique stretch-strong slip superimposed, and continuing strong strike-slip pull-type, and expounded the different control effects of various genetic evolution models on the formation of traps, reservoir development and hydrocarbon migration, established the response relationship between structure and hydrocarbon accumulation. The results show that the southern Bohai Sea is in the double stress field since the Cenozoic era, which are respectively north-south extension caused by mantle uplift and NE-SW trending dextral shear caused by oblique compression of Pacific plate, the three branches of the Tanlu fault belt have the same tectonic evolution stages. However, as dominant stress field are different in different times in different regions, their structure and evolution characteristics are significantly different, which controls and influences the difference of hydrocarbon accumulation in the oil and gas accumulation period, horizon, scale between the three branches.