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根据马岭油田北三区6口井岩心观察和约90口井的单井沉积相、剖面相以及平面相分析等综合研究,查明马岭油田北三区延安组Y8油层、Y9油层、Y101砂组为曲流河沉积,其沉积微相可进一步划分为:河床滞留沉积、边滩、废弃河道和河漫滩4种类型。
Based on the core observation of 6 wells in Beisi district of Maling oilfield and the single-well sedimentary facies, profile facies and plane facies analysis of about 90 wells, it is found that Y8, Y9 and Y101 sand of Yan’an Formation in North Third Maling Oilfield are Meandering river sediments, the sedimentary microfacies can be further divided into: river bed sediment deposition, beach, abandoned river and river floodplain 4 types.