渤海湾盆地东营—惠民凹陷油气成藏模式和油气富集控制因素

东营凹陷和惠民凹陷作为济阳坳陷南部两个相邻的、构造格局相似的陆相箕状断陷,其石油地质特征有相似之处,但油气富集程度有明显差异。控制油气富集的主要因素有油源条件、构造特征、火山活动以及生储盖组合与构造的配置等。生储盖组合与构造特征的配置,是造成不同构造部位主要储油气层位和油气藏类型差异性的直接原因。结合油源特征、生储盖组合和输导系统特征,东营、惠民凹陷的油气成藏模式可归为5种类型:洼陷带自生自储-侧向运移成藏模式、洼陷区上生下储-垂向运移成藏模式、中央隆起带和北部陡坡带下生上储-垂向运移成藏模式、南部斜坡带下生上储-复合运移成藏模式和周边凸起区新生古储-复合成藏模式。 

POOL-FORMING PATTERNS OF HYDROCARBON AND CONTROLLING FACTORS OF HYDROCARBON ENRICHMENT IN THE DONGYING AND THE HUIMIN SAGS

As two adjacent continental listric faults in the southern part of the Jiyang Depression, the Dongying and the Huimin sags have similar tectonic framework. They have similar petroleum geological characteristics, but their hydrocarbon enrichment degree is apparently different. The major factors controlling hydrocarbon enrichment include oil source conditions, structural features, volcanic activities and the collocation of source rock reservoir caprock assemblages to structures. Among them, the collocation of source rock reservoir caprock assemblages to structures is the direct reason to result in the differences of major hydrocarbon bearing horizons and hydrocarbon pool types in different tectonic position. Combined with oil source features, source rock reservoir caprock assemblages and conveyance system characteristics, the pool forming patterns of hydrocarbon in the Dongying and the Huimin Sags can be classified as five kinds, that is, the self generating and self reserving lateral migration pool forming pattern in swale zones, the upper generating and lower reserving vertical migration pool forming pattern in swale areas, the lower generating and upper reserving vertical migration pool forming pattern in central uplift and northern steep slope zones, the lower generating and upper reserving composite migration pool forming pattern in southern slope zones and the new generating and paleo reserving composite pool forming pattern in circumferential convex areas.