金湖凹陷断层封闭性研究及应用

针对金湖凹陷阜宁构造层断层封闭具多样性,通过解剖不同类型油气藏和不成藏断块,发现断层活动性对封闭性能影响显著,按照断层活动时间与含油气系统关键时刻的相对关系,划分为早期断层和长期断层。通过对断层封闭成因机理的分析,认为两类断层活动性质和作用不同,控制着断块圈闭油气聚集及油、水分布。早期断层封闭性好,断块圈闭形成多油、水系统的层状油气藏;长期断层封闭性具多样性,断块可形成具统一油、水系统的层状油气藏或向上调整成藏或不成藏。该认识在勘探中可用于目标、井型选择及预测油水边界。

A Research On Fault Sealing Capacity in Jinhu Depression

Various fault seals exist in Funing structure in Jinhu depression.It is discovered that fault activity has large im-pacts on sealing capacity through study on reservo irs of dif-ferent types and on fault blocks with no reservoirs.Two types of faults,early stage faults and long stage faults re-spectively,are identified according to the relations between time of fault being active and the critical time of oil-bear-ing system.Based on genetic mechanism study of fault seals ,it is believed that they have different properties and functions and control hydrocarbon accumulation and distri-bution of oil and water in fault block trap s.The early stage faults have good sealing capacity and layered reservoirs with multi oil and gas systems existing in fault block traps.While the long stage faults have variable sealing capacities,layered reservoirs with common oil and water system may exist,or no reservoirs exist.These understandings can be used to select exploration targets,to determine exploratory well types and to predi ct OWC.