【摘要】 渤海湾盆地南堡凹陷具有良好的油气勘探前景,已发现的油气藏多为构造型油气藏,但油气资源的分布特征不明确,无法有效地指导勘探。通过分析,揭示出地质相、流体势和烃源灶是南堡凹陷油气分布的3个主控因素。应用相-势-源复合的方法,对南堡凹陷的油气分布特征进行研究。研究表明:地质相控油气作用的基本模式为"优相-高孔渗"控藏,流体势控油气作用的基本模式为"低势"控藏,烃源灶控油气作用的基本模式为"近源"控藏。在此基础上,建立了"近源-优相-低势"控藏的综合模式,并运用该模式对南堡凹陷的油气分布进行了预测。结果表明:背斜类油气藏的潜在勘探目标位于北堡构造带的Ⅰ级有利区和南堡4号构造带的Ⅱ级有利区;断块类油气藏的潜在勘探目标位于北堡构造带的Ⅱ级有利区、南堡3号构造带的Ⅱ级有利区、南堡4号构造带的Ⅱ级有利区和南堡5号构造带的Ⅲ级有利区。更多还原

【Abstract】 Nanpu depression in Bohai Bay Basin has large petroleum exploration potential,and most of the reservoirs discovered in the depression are of structural type.However,the distribution pattern of petroleum resources is still unclear,so it is diffficult to effectively develop petroleum exploration.Geofacies,fluid potential and hydrocarbon kitchen are believed to be main factors controlling hydrocarbon distribution in Nanpu depression.Geofacies controlls hydrocarbon distribution by"favorable facies combined with high porosity and permeability"pattern,fluid potential controlls by"low potential"pattern,and hydrocarbon kitchen controlls by"near source"pattern.Based on these patterns,we established a comprehensive hydrocarbon accumulation model of"near source-favorable facies-low potential",which was applied to predict petroleum accumulation distributioin in Nanpu depression.Potential anticlinal reservoirs may occur in the first-order favorable area in Beipu structural belt and the second-order favorable area in Nanpu No.4 structural belt,whereas potential fault-block reservoirs may occur in the second-order favorable area in Beipu structural belt,second-order favorable area in Nanpu No.3 structural belt,second-order favorable area in Nanpu No.4 structural belt and third-order favorable area in Nanpu No.5 structural belt.更多还原