关键词: 济阳凹陷, 网毯式油气成藏体系, 新近系, 地层超覆油气藏, 岩性油气藏

Abstract: Based on more than 30 years' research in reservoir forming mechanism and exploration practice in Neogene system in Jiyang Depression, theory of fault-fracture mesh petroleum plays was put forward. This kind of oil-gas migration and accumulation pattern determined that those inherited draping anticlinal structural belt were favorable for oil and gas to accumulate and easy to form reservoir. At basin margin, if caprock stably developed, stratigraphic overlap trap would form in storage layer. On condition of well developed source fault and badly developed secondary fault, oil and gas would migrate laterally and form stratigraphic overlap reservoir. As for area inside the basin, if secondary fault belt was connected with source fault, or structural belt with source fault connected storage layer and secondary fault network connected storage layer as well as favorable reservoir-caprock assemblage, lithologic reservoir would come into being. All elements composing the theory were analyzed. With application of this theory, breakthrough progresses were made in exploration of stratigraphic overlap reservoir at basin margin and lithologic reservoir inside the basin in Neogene system of Jiyang Depression.

Key words: Jiyang Depression, fault-fracture mesh petroleum plays, Neogene, stratigraphic overlap reservoir, lithologic reservoir