The reservoir rocks of Beipu region in Huanghua Depression are deep seated igneous rocks of Sha-1 and Sha-3 members.The reservoir rocks are mainly pyroclastic rocks and basalts.Fractures are primary preserving spaces of the basalts;intergranular secondary pores and micro fractures are the basic preserving spaces of pyroclastic rocks.The reservoirs are characterized by considerable variation in porosity and permeability.The development of preserving spaces of igneous rocks are controlled by lithologic feature

rock facies zone

tectonic stress and the coincidence of filling stage with oil accumulation stage.The pyroclastic rock of Sha-1 member developed well with small distribution range;the basalt of Sha-3 member are distributed extensively with considerable thickness.The highes on the top structures are targets for further exploration.