济阳坳陷中生界古潜山油藏输导体系及成藏模式

Migration System of Mesozoic Buried-Hill Oil Pools and Hydrocarbon Accumulation Models in Jiyang Depression

济阳坳陷中生界古潜山具有构造变动复杂、储层非均质性明显等特点,输导体系的确定一直是该类油藏研究的难点。通过对济阳坳陷中生代以来的构造格架和沉积充填的研究,识别出不整合面、断层和潜山储集层3种输导类型。且研究表明济阳坳陷中生界发育40余条主断层和3个重要的不整合面,这些纵横交错的深大断裂与不整合面共同构成了中生界古潜山油藏的主要输导通道,并与潜山储集层一起对油气成藏起决定作用。根据断层和不整合面对油气输导作用的大小可识别出断层主导型和不整合面主导型两种输导通道组合,由此总结出凸起带、缓坡带和逆冲—褶皱带3种油气成藏模式。

The Mesozoic buried-hill is characterized by multiple strong tectonic movements and complex reservoir heterogeneity.It is very important to study hydrocarbon migration system during the exploration of the buried-hill in Jiyang Depression.Based on the study on structural framework of Jiyang Depression since Mesozoic,unconformity, fault and buried-hill reservoir were identified as three important conduit types.It is shown that nearly 40 main faults and 3 important unconformities in the Jiyang Depression,serve as the main conduits of buried-hill oil pool and control the characteristics and styles of petroleum accumulation with these buried-hill reservoirs.The classification of fault-dominated and unconformity-dominated conduits sets is made on the basis of their functions, and three petroleum accumulation models have been summarized,i.e.paleouplift zone, gentles slope zone and reversed-fold zones.