金湖凹陷古近系戴一段成藏条件和成藏模式研究

基于22口探井取心、测录井、地化及分析测试资料的综合分析，认为金湖凹陷古近系戴一段
具备阜四和阜二段2套烃源岩多源供烃的有利条件，其中凹陷断裂带油气来自阜四段烃源岩，斜坡
带来自阜二段烃源岩。 戴一段的三角洲河道砂体发育，与上覆“五高导”泥岩组成良好的储盖组合&。同
时本区还具备了由砂层、断层、不整合3 种类型通道共同构成的良好油气运移网络。在此基础上，建
立了金湖凹陷构造油气藏和隐蔽油气藏!2种成藏模式，其中构造成藏模式又可分为断裂带和斜坡带2
!种成藏模式，这对优选有利区带及下步勘探起着重要的指导意义。

Petroleum accumulation in lower Dainan Formation of Paleogene in Jinhu Sag

Based on the analyses of coring, logging, geochemical and testing data of 22 prospecting wells, it is believed that the lower Dainan Formation of Paleogene in Jinhu Sag has favorable source rocks, including the fourth and the second member of Funing Formation. Petroleum in the fault zone and in the slope zone respectively come from the source rocks in the fourth member and the second member of Funing Formation. Delta channel sandbodies that developed well in lower Dainan Formation together with the overlying mudstone characterized by high conductivity compose the favorable reservoir-seal assemblage. Sandbody, fault and unconformity build up the petroleum migration pathway in this area. Two kinds of petroleum accumulation models are established in Jinhu Sag for subtle reservoir and structural reservoir. The accumulation model for structural reservoir can be divided into two kinds for fault zone and slope belt, which is favorable for guiding the further exploration.