关键词: 坳陷, 构造, 构造运动, 油气资源评价

Abstract: Kaifeng depression,situated in the northern part of the southern North China basin,mainly extending in NWW direction structurally and in the NNE-NE directions in some segments,is a fault-subsided Meso-Cenozoic depression. Its formation was resulted from theNWW faulting with sinistral shear-extensional movement and the NNE-NE faulting withdextral shear-extensional movement,which occurred in the late stage of the early Cretaceous,through the late stage of the Palaeocene and the Eocene.16 wells have been drilled in the depression,4 source bed systems of-O,C-P,J-K andE have been identified.Petroleum resource evaluation showed that there are geological conditions for only small-sized pools in Meso-Cenozoic,and for larger sized pools in Palaeozoic.

Key words: sag, structure, tectonic movement, evaluation of oil and gas resources