【摘要】 利用野外露头、现代沉积和大量岩心以及钻测井资料,以高分辨率层序地层学原理为指导,结合地震和探地雷达,分析了W油田新近系明化镇组明下段河流相层序格架和砂体结构的沉积特征,总结了砂体的发育规模特征,建立了河流相砂体的沉积模式,为海上油田开发及后期调整提供依据和指导。研究表明,渤海海域明化镇组河流相砂体结构划分为堆叠型、侧叠型和孤立型3种类型共7种样式,其中侧叠型又分为紧密型、疏散型和离散型;孤立型又分为下切侵蚀型、孤立河道和决口扇;河道砂体厚度为2.1~15m,平均6.75m;宽度为200~1 225m,平均宽度519m。决口扇砂体厚约2~3m,宽度为150~450m,平均宽度300m。河流相砂体结构受控于湖平面的变化。不同的湖平面变化下发生堆叠型、侧叠型和孤立型规律性的砂体结构变化。更多还原

【Abstract】 According to the analysis of outcrops,modern sedimentary,well cores,well-logging and ground penetrating radar(GPR),guided by the theory and technology of high-resolution sequence stratigraphy,the high-resolution sequence stratigraphic framework and architecture of sandbody of the Minghuazhen Formation of W oilfield have been investigated.The distribution characteristic of sandbody in sequence stratigraphic framework has been illustrated and fluvial facies models have been set up.It will provide the basis and guidance for oilfield development and the adjustment of the later development of offshore oilfield.We have identified 3classes and 7types of sandbody architecture of Minghuazhen Formation in Bohai bay basin,in which 3classes comprise amalgamated channel complex(ACM),stack channel(SC)and isolated sandbody(IS),and stack channel(SC)is further divided into intimated contact(IC)and evacuated contact(EC)and discreted contact(DC),and isolated sandbody(IS)includes incised channel(IIC),crevasse-splay(CS)and isolated channel(ICH)3types.The study demonstrated that the channel sandbody thickness is 2.1-15 m;the average thickness is 6.75m;the wideness is 200-1225m;and the average wideness is 519 m.The crevassesplay sandbody thickness is 2-3 m;the wideness is 150-450 m;and the average wideness is 300 m.It is demonstrated that the fluvial sandbody architecture was mainly controlled by the change of relative lake level.With the changing of lake level,fluvial sandbody reservoir underwent a complex evolutionary process,including amalgamated channel complex,stack channel and isolated sandbody.更多还原