辽河坳陷潜山内幕多期裂缝油藏成藏模式

Formation model of multi-stage fracture reservoirs inside the buried hills in Liaohe Depression

潜山表层风化壳可形成油藏的观点已被广泛接受,但潜山内幕深部能否形成大规模油藏目前还不十分清楚。以辽河坳陷西部凹陷兴隆台地区潜山为研究对象,从潜山岩性、构造活动、生烃系统、输导方式等角度论述了潜山多期裂缝成藏模式的发育依据,建立了潜山多期裂缝油藏成藏模式,认为兴隆台潜山带具有极好的油气源条件和运移输导条件:潜山内幕多期发育而不均匀分布的断层和裂缝可对油气运移起沟通作用,形成具有相互连通而又相对独立的多个含油气层段的油气藏体系。在该成藏模式指导下部署的兴古7井揭露了具有千余米整体含油幅度的特大型潜山内幕油藏,为在辽河坳陷乃至全国扩展潜山深层勘探领域提供了依据。

It has been accepted that reservoirs can be formed in the weathoring cruist at the top of buried hills,But wbether they can be formed in the deep side of buried hills remains nnknown,This poper focuses on the buried bill in the Cinglongtoi area of west sag in Liaohe Depression.The development of the multi-stnge fracture reservoir is discussed from such aspects as buricd hill lithology,tectonic movement,and hydrocarbon generation system and transport mode.A formation model of multi-stage fraclure rosecvoirs is cstablished.Under the guide of it,Well Cinggu 7was drilled and a large reservoir about 1000 meters high in thd deep side of hurled hill was found.It paves the way for the expiloration into the deep side of buried hills in Liaohe Depression and around the country.