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利用岩心、薄片、粒度分析以及测井等资料，详细地研究了泥岩的颜色、岩石的结构、沉积构造、沉积韵律以及垂向沉积序列等特征，确认齐北地区杨大城子油层主要为河流相沉积，并可区分出高弯度曲流河与低弯度曲流河沉积。描述了齐北地区河流相各沉积微相特征，并建立了高弯度曲流河沉积模式和低弯度曲流河沉积模式。河流相中发育有河道砂体和堤岸薄互层砂体，其中河道砂体在空间上具较大规模，且含油性能好，是杨大城子油层有效储集砂体。
The characteristics of mudstone color, rock structure, sedimentary structure, sedimentary rhythm and vertical sedimentary sequence are studied in detail by using core, thin slice, grain size analysis and well logging data. It is confirmed that the Yang Dachengzi oil layer in Qibei area is mainly composed of fluvial facies Sediment, and can distinguish between high-curvature meandering river and low-curvature meandering river sediments. The characteristics of sedimentary microfacies of the river facies in Qibei area are described, and the sedimentary model of high-camber meandering river and the low-camber river are established. River fluvial facies and embankment thin interbedded sand bodies are developed in fluvial facies. Among them, fluvial sand bodies are larger in space and have good oil-bearing properties, which are effective reservoir sand bodies for Yang Dachengzi oil layer.