网毯式油气成藏体系在勘探中的应用

Application of fault-fracture mesh petroleum plays in exploration

网毯式油气成藏体系是在济阳坳陷30多年油气勘探的实践中,对新近系油气成藏机理研究的基础上提出来的。这种油气运聚方式决定了那些与洼陷内油源断层直接相接的继承性披覆背斜构造带是油气运移成藏的主要部位。在盆缘,如果发育较稳定的盖层,仓储层会形成地层超覆圈闭,在油源大断层发育而次生断层不发育的情况下,油气在仓储层中横向运移后易形成地层超覆油气藏;在盆内,那些与大油源断层直接相接的次生断裂带,或者具备油源断层与仓储层相接、且次生断裂与仓储层和有利储盖组合的储集层相接的区带,可形成岩性油气藏。根据该理论,深入分析了网毯式油气成藏体系各要素,使济阳坳陷的新近系盆缘地层超覆油气藏与盆内岩性油气藏勘探均取得了突破性的进展。

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.