济阳坳陷不同区带构造样式发育与油气富集差异性分析

Difference analysis of structural styles and hydrocarbon enrichment in different zone of Jiyang Depression

构造样式控制沉积并决定油气富集。通过对济阳坳陷盆地结构特征、构造演化、地震资料及不同区带油气地质模型的分析,认为该坳陷构造样式主要有翘倾断块、滑动断阶、潜山披覆、重力构造、底辟构造等7种类型,不同构造带是由断陷期发育的不同类型的构造样式叠置组合而成:陡坡带是由早期板式断层被晚期滑动断阶、逆牵引背斜改造而成,中央隆起带是由晚期的背斜、半背斜叠加在早期洼陷之上而成,缓坡带是由早期和晚期不同类型翘倾断块叠置而成,凸起带是在潜山背斜背景上发育起来的披覆构造;不同区带构造样式发育的差异,控制了油气富集的差异,凸起带、底辟背斜的中央隆起带及主控断层演化程度高的陡坡带油气富集。

Structural styles control the deposition and oil-gas accumulation. According to analysis of the charac- teristics of basin structure, tectonic evolution, seismic data and different zone oil-gas geological model in Jiyang depression, the conclusions are that, there are seven secondary structural styles including tilted faulted-block, slide faulted-ramp, buried hill draping, gravitative antiform and diapir structure in the basin. Different structural belt is formed of different superimposed structural styles. In the rift period, the steep slope zone evolved from the early plate faults into late slide block or rollover anticline, the central uplift belt is formed of late anticline or half anticline overlaying on the early subsag, the gentle slope belt is composed of different types of early and late over- lying faulted block, the bump belt is formed of buried hill and draping anticline. Differences of tectonic styles de- velopment control the oil-gas accumulation differences in different structural zones. Oil-gas enrich in the bump belt, the central uplift belt of diapiric anticline controlling and the steep slope of main control fault with a high evolution degree.