济阳坳陷三合村洼陷油气运移与聚集规律

Hydrocarbon migration and accumulation patterns in Sanhecun Sag of Jiyang Depression

利用钻井、地化等资料,通过油气运移路径恢复、油源对比等方法,对渤海湾盆地三合村洼陷油气的运移与聚集规律进行研究。结果表明,在东营期和馆上—明化镇期,北部渤南洼陷沙河街组油气对三合村洼陷进行过两期充注,具有"泾渭分明"的运移路径和油气聚集特征。东营期,渤南洼陷沙四段烃源岩油气沿Tr不整合面运移至三合村洼陷,再沿沙河街组沙三段骨架砂体横向运移,在沙三段地层圈闭和岩性圈闭中聚集成藏。馆上—明化镇期,渤南洼陷沙三段烃源岩油气先沿断层纵向运至新近系馆陶组,再沿馆陶组骨架砂体横向运移至三合村洼陷,在馆陶组构造圈闭、岩性圈闭和地层圈闭中聚集成藏。

The hydrocarbon migration and accumulation patterns in Sanhecun Sag of Jiyang Depression are studied through the restoration of hydrocarbon migration path and the correlation of oil with source rocks based on drilling and geochemical data. The results show that the hydrocarbon in Sanhecun Sag come from Bonan Sag and the hydrocarbon was filled two times respectively in Dongying period and upper Guantao--Minghuazhen period. In Dongying period,the hydrocarbon coming from the source rocks of Es4 in Bonan Sag migrated to Sanhecun Sag along Tr unconformity and the sand body in Es3 and accumulated in the stratigraphic traps and the lithologic traps in Es3. From the upper Guantao to Minghuazhen period,the hydrocarbon coming from source rocks of Es3 in Paleogenein Bonan Sag migrated vertically along fault to the sandbody in Guantao formation in Neogene,and then migrated laterally along the sand bodies in Guantao formation to Sanhecun Sag. Therefore the structural reservoirs,lithologic reservoirs and stratigraphic reservoirs in Guantao formation formed.