大庆油田喇嘛甸至萨中地区的葡１２油层位于松辽盆地北部大型沉积体系泛滥平原相末端，内部发育着２类性质截然不同的大型河流砂体，传统地质研究方法始终不能准确地鉴别其成因。近年来通过大面积密井网资料的精细地质研究，证实了这２类砂体分别属于泛滥平原下游的大型曲流河及砂质辫状河砂体，为正确认识储层非均质特征和改善油田开发效果提供了科学依据。 Pu 12 reservoir of Daqing oil field from Lamadian to Sazhong area is located at the end of floodplain facies of large-scale sedimentary system in northern Songliao basin. There are two types of large-scale river sand bodies with different properties. The traditional geological research methods can not accurately identify its origin . In recent years, the fine geological study of large-area dense-well network data has confirmed that these two types of sand bodies belong to the large meandering river and the sandy braided river sand body, respectively, which are located downstream of the flood plains. In order to correctly understand the reservoir heterogeneity and Improve the effectiveness of oilfield development provides a scientific basis.