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中国东部第三纪陆相断陷盆地有丰富多采的隐蔽油藏,它是一个重要的勘探领域。文章首先论述了陆相断陷盆地形成隐蔽油藏的有利地质条件:(1)断陷分割、岸线长;(2)砂体多规模小、岩性变化大;(3)块断活动造成大量古潜山、地层不整合和地层超覆;(4)有多方向的断裂系统;(5)一部分小型断陷的构造圈闭不发育。本文将箕状断陷划分为三个带:陡坡带、缓坡带和深陷带。根据各个带的地质条件而形成各种类型的隐蔽油藏。
The Tertiary continental rift basin in eastern China has a rich reservoir of subtle reservoirs, which is an important exploration area. The article first discusses the favorable geological conditions for the formation of subtle reservoirs in the continental rift basin: (1) the fault division and long coastline; (2) the sand body is small in scale and the lithology changes greatly; (3) A large number of buried hills, strata unconformity and stratigraphic overrun; (4) multi-directional fault systems; and (5) structural traps of some small faults are not developed. This paper divides the half-graben fault into three zones: steep slope, gentle slope and deep depression. Various types of subtle reservoirs are formed according to the geological conditions of each belt.