乌尔逊凹陷西部边界断裂的幕式演化模式及其对含油气系统的控制作用

海拉尔盆地乌尔逊凹陷西部的边界断层-乌西断裂, 对该凹陷的构造演化具有明显的控制作用。研究发现该断裂的生长发育有着明显的幕式演化特点: 经历了分段连锁、宁静、活化和反转等4 个演化阶段, 每一阶段都有不同的构造和沉积特点。其中, 分段连锁和活化阶段是凹陷的主要生长期, 分段连锁阶段以发育张性断块构造样式为特征, 活化阶段则以发育盖层滑脱型构造样式为主。乌西断裂的幕式演化对乌尔逊凹陷烃源岩演化、储盖系统的分布及含油气系统具有一定的控制作用。

Episodic evolution model of boundary fault and its controlling function to petroleum systems in western Wuerxun depression

Wuxi fault is the boundary fault of western Wuerxun depression in Hailar Basin, which plays an important role in tectonic evolution to the depression. The development of Wuxi fault presents Episodic evolution feature and undergoes four formation stages, including of the separate chain, motionlessness, activation and reverse. Separate chain and activation stages are the main growth periods of the depression. The separate chain stage is characterized by tensional block structural style while in the activation stages developde in cap decollement struc tural style. Episodic evolution of Wuxi fault plays the control role in source rock evolution, reservoir and cap distribution and petroleum system of Wuerxun depression.