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松辽盆地葡北油田葡Ⅰ组油层平面上砂体发育规模小 ,分布零散 ,纵向上高泥高钙薄夹层特点突出 .按照等期对比原则 ,旋回对比 ,分级控制 ,以一期沉积的砂层作为岩相细分与对比的最小单元 ,将葡Ⅰ组油层细分为 3个砂岩组 ,11个小层 ,2 6个沉积单元 ,并进一步细分为湖退型外前缘、湖退型过渡相、湖退型内前缘、稳定型内前缘、湖进型内前缘、湖进型过渡相和湖进型外前缘 7种沉积亚相及 8种沉积微相、2 0多个测井相模式 ,其中三角洲内前缘以水下分流河道砂沉积为主 ,三角洲外前缘以席状砂和透镜状砂沉积为主 .
Sandstone body of Pu Ⅰ Formation in the Pubei Oilfield of Songliao Basin is small in scale and scattered in distribution, and the characteristics of thin, high-mud and high-calcium sand interlayer are prominent in the longitudinal direction.According to the principle of equal period contrasting, cyclone contrast and grading control, As the smallest unit of lithofacies subdivision and contrast, the oil layer of Pu Ⅰ reservoir is subdivided into three sandstone groups, 11 sub-layers and 26 sedimentary units, and further subdivided into lake front outer edge, lake retreat Transitional facies, inner retreat lake front, stable inner front edge, inner lake front, lake transitional facies and lake front 7 sedimentary subfacies and 8 sedimentary microfacies, 20 A number of logging facies patterns, including the delta front within the distributary channel sand sediment-based, the outer edge of the delta-shaped sand and lens-shaped sand deposition.