Dongpu depression, a oil-gas bearing basin, is situated in the southwest Bohaiwan basin.Puwei sag is a subunit that is tectonically located in the north central upheave of Dongpu depression.

陷是渤海湾西的一个含油气盆地，洼陷构造位置上处于陷中央隆起带北，为一负向次级构造单元。