To establish the fine stratigraphic framework and definite the sedimentary microfacies and depositional model of Lüda 10-1 Oilfield is necessary for field development. Oil group Ⅱ and Ⅲ of the under second member of Dongying Formation are corresponding to twomiddle-term declining hemicycle in Lüda 10-1 Oilfield, sediment source came fromnorthwest provenance, sediments followed twomain branches of watercourses towards the basin, and formed underwater distributary channel, mouth bar and sheet sands deposition within braided river delta front. Sand body thickness of oil group Ⅱ is great, sand body thickness of the small layer is generally greater than 10 m, the sand bodies distribute in the whole region, from northwest to southeast, and along the direction of sediment source, sand bodies extend up to 2 000 m. The sand body thickness of oil group Ⅲ is thinner, sand body thickness of the small layer is generally less than 8 m, and sand bodies extend about 1 000 malong the direction of sediment source.