一、不整合对于油气运移聚集的重要性 A.I.Levorsen早已指出不整合对于油气聚集有密切的关系。世界上这种例子很多,不胜枚举。现仅举几个著名油田为例,以说明之。例如委内瑞拉马拉开波(Maracaibo)盆地的玻利瓦尔(Bolivar)沿岸油田,在不整合面的上下都有油藏(图1),其上为中新统砂岩油藏,其下为始新统油藏。J.B.Miller等认为不整合面上的中新统石油来自始新统。又如我国玉门老君庙油田,过去对于该油田的油源一直是个争论的问题。现据石油部石油地质工作者对原油中孢粉和原油的分析,有充分证据证明储在第三系底部砂岩中的油(老君庙、石油沟油田)以及鸭几峡基岩中的油都是来自白垩系下统的。这些油田不仅油质相似,而且原油中都含有早白垩世的孢粉组合。青西凹陷下白垩系黑色页岩是生油母岩。由青西凹陷下白垩系所生的油,向下挤压至白垩 I. THE IMPORTANCE OF DISCONNOCATION FOR HYDROCARBON MIGRATION AND ACCUMULATION A.I. Levorsen has long pointed out that unconformities have a close relationship with hydrocarbon accumulation. There are many such examples in the world. Just to name a few famous oilfields, for example. For example, the Bolivar shores of the Maracaibo basin in Venezuela have reservoirs above and below the unconformity (Figure 1), which are Miocene sandstone reservoirs underneath System reservoir. J. B. Miller et al. [19] consider that the Miocene oil on the unconformity comes from Eocene. Another example is China’s Yumen Laojunmiao oilfield, the oil source for the field in the past has been a controversial issue. According to the analysis by petroleum geologists of the Ministry of Petroleum on the sporopollen and crude oil in crude oil, there is ample evidence that the oil stored in the sandstone at the bottom of Tertiary (Laojunmiao and Shigougou oilfields) and the oil in the bedrock of the Duogangxia All come from the Cretaceous. These fields are not only similar in oil quality, but also contain early Cretaceous sporopollen assemblages in crude oil. The Lower Cretaceous black shale in Qingxi sag is a source rock parent. The oil from the Lower Cretaceous in the Qingxi sag is squeezed down to the chalk