胜利海上埕岛油田下古生界潜山高产因素分析

Reason Analysis of High Hydrocarbon Production from Paleozoic Buried Hill Reservoirs in Offshore Chendao Oil Field,Shengli Oil Province

埕岛油田是我国浅海—极浅海海域发现的第一个大型整装油气田,四周环凹,油源条件十分优越。全区可划分为西排山、中排山、东排山三个潜山带构造单元。油气运移通道主要是断裂和风化壳不整合面,区域盖层发育良好。储集条件是油气富集高产的控制因素。纵向上潜山带储层主要集中在潜山的风化壳;平面上主要沿断层分布。沿断层发育的奥陶系潜山是本区古生界潜山勘探的最有利目标。

Chendao Field,which sits on offshore Bohai Gulf,is the first large integrated oil field discovered in shallow-shallower seas in China.It may be divided into three structural units including Xipai Shan,Zhongpai Shan and Dongpai Shan buried-hill zones,which are surrounded by sags and have well-developed regional caprock and excellent hydrocarbon source condition. The main migration paths of hydrocarbon are fractures and weathering unconformity interfaces.Reservoir conditions are the factors dominating hydrocarbon enrichment and high- production.The reservoirs are mainly present in the weathering crust of buried-hills in longitudinal section and distributed along fractures in plane.It is believed that the Ordovician buried-hills developed along fractures are the most favourable exploration targets of Paleozoic buried-hill zones in this study area.