Paleogene Reservoir in Nanpu sag, Bobal Bay basin is a main producinginterval.It develops many types of pores which are mainly secondary pores and haschangeable properties.

• 南堡凹陷下第三系砂岩储层是冀东油田的主力储层，发育多种孔隙类型但以次生孔隙为主，物牲变化复杂。