Upper Guantao formation in Laohekou oilfield of Shengli oil province is a typical reservoir of fluvial facies with major oil - bearing system containing meandering and braided river sedimentation.

• 胜利油区老河口油田的馆上段为典型的河流相油藏,主力含油层系存在曲流河沉积和网状河沉积。