柴达木盆地断裂特征与油气区带成藏规律

THE CHARACTERISTICS OF FAULT SYSTEM AND ITS CONTROL ROLE TO PETROLEUM ZONE IN QAIDAM BASIN

由于基底断裂、基底岩性及局部应力环境的差异 ,柴达木盆地在地史演化中形成了北缘、中部和昆北三大各具特征的断裂构造系统 ,它们控制了北缘、一里坪—甘森湖、中部区、中南隆起区、英雄岭—茫崖、阿尔金南和昆北共七个成藏特征各不相同的油气区带 ,各断裂构造系统中的断裂还控制了各区带具体油气藏的形成。中南隆起区是七个油气区带中乞今唯一没有油气藏发现的构造单元 ,它具有较好的油气运聚成藏条件 。

Because of the differences of the basement fault and basement lithology as well as stress environment, three distinctive kinds of fault systems are developed respectively during evolution history of Qaidam basin, which are northern margin, middle region of the basin and north Kunlun Mount. They dominate seven petroleum zones-northern margin, Yili Ping to Gansheng Lake, middle region, middle south rift, hero peak to Mangya depression, south Arjin Mountain and north Kunlun Mount, different in hydrocarbon accumulation and formation. The middle south rift region is the sole one district where no petroleum pool has been found so far. In this paper, we believe that in the middle south rift region there are better conditions of formation of petroleum reservoir and it will be a strategically important breakthrough region for oil and gas exploration.