结合岩心、薄片、分析测试和测井曲线等资料,对F油田明化镇组下段Ⅳ油组沉积微相进行综合分析.研究表明:Ⅳ油组储层砂岩主要为长石砂岩和岩屑长石砂岩,分选中等,磨圆度以次棱 — 次圆状为主.岩心中可见典型河流相的沉积构造,测井曲线特征包括箱形、钟形、漏斗形、指形、线形.Ⅳ油组发育曲流河沉积相,包括河道和边滩、天然堤、决口扇、漫滩沉积、废弃河道和泛滥沼泽沉积微相.Ⅳ4砂组以泛滥平原沉积为主,从Ⅳ3砂组开始,物源供应增强,平面上发育3至4条曲流河道,Ⅳ1砂组沉积时期河道规模开始变小.%Based on the data of cores,thin section,sample analysis and well logging, the sedimentary microfacies of Ⅳ oil group of lower Minghuazhen formation(N1 m)were comprehensively studied. The reservoirs are mainly composed of feldspar sandstone and lithic arkose,and the sandstone of reservoir in lower N1 m is mainly of medium sorting and subangular-subround roundness. Ⅳoil group developed various sedimentary structures that can reflect river deposition. Well logging characteristics mainly include box shape, bell shape, hopper shape, figure shape and line shape. Ⅳ oil group developed meandering river facies, and the following sedimentary microfacies were mainly developed,e.g. channel fill-point bar, natural levee, flood plain, abandoned channel, crevasse splay and flooding swamp. Ⅳ4 sub-oil group mainly developed flooding swamp; the provenance supply was gradually strengthened since Ⅳ3 sub-oil group. 3-4 meandering channel were developed, and the channel scale became small in Ⅳ1 sub-oil group.
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