苏北盆地高邮凹陷戴南组隐蔽油气藏研究

Research on Subtle Hydrocarbon Reservoirs of Dainan Formation in Gaoyou Sag of Subei Basin

基于对地震、地质和测井资料的综合研究,将苏北盆地高邮凹陷戴南组自下而上划分为SⅢ5、SⅢ6、SⅢ7共3个三级层序和8个体系域,建立了凹陷西部具断裂坡折带和凹陷东部无明显坡折带两种不同的层序地层样式。分析了戴南组隐蔽油气藏的形成条件及控制因素,通过建立戴南组隐蔽油气藏有利勘探区评价标准,结合凹陷主要勘探地区层序地层、沉积相、油源、储盖配套和保存等条件的分析研究,评价出Ⅰ类有利勘探区2个(联盟庄—马家嘴地区、邵伯—真武地区),Ⅱ类较有利勘探区3个(永安—富民西地区、黄珏西地区、周庄—陈堡地区)。

According to the comprehensive study of seismic,geological,and logging data,the Dainan Formation of Gaoyou sag is divided into three sequences,i.e.,SⅢ5,SⅢ6,SⅢ7,and eight system tracts from the bottom to the top.Two different sequence frameworks are established,i.e.,the west part of Gaoyou sag with fault breaks and the east part without obvions fault breaks.The factors controlling the accumulation of subtle reservoirs of the Formation are analyzed.Based on the establishment of the assessment criteria of the favorable exploration areas and combined with the analysis of conditions including sequence strata,sedimentary facies,resource rocks,reservoir and cap rocks assemblages,two favorable exploration areas (Lianmengzhuang-Majiazui area and Shaobo-Zhenwu area)and three preferable exploration areas(Yongan-Fuminxi area,Huangjuexi area,and Zhouzhaung-Chenbao area)are assessed.They are the targets for subtle reservoirs exploration in the future.