水驱断块油藏构造低部位剩余油富集成因分析

Origin analysis of remaining oil enrichment at lower location of the structure in waterflooding fault block oil reservoir.

根据滨南油田的油藏精细描述成果 ,发现在水驱油藏开发后期 ,条件适宜时构造低部位仍存在数量可观的剩余油。综合利用薄片分析、油藏开发动态等资料 ,分析了该类剩余油富集的成因 ,指出了孔隙结构、正向微构造、水驱压力是控制构造低部位剩余油富集的主要因素。在滨 35 - 6 4块预测了四个剩余油富集部位 ,其中两个部位已得到证实。

Considerable remaining oil may exist at lower location of the structure in later period of water drive pool at suitable conditions according to the results of fine reservoir description in Binnan oilfield. The origin of this type of remaining oil enrichment is analyzed using the data of slice analysis and reservoir development performance comprehensively. It is pointed out that pore structure, positive microtectonics and waterflood pressure are the main factors of controlling the enriched remaining oil at lower location of the structure. Four zones of enriched remaining oil are predicted in Bin 35-64 block, and two of them are proved.