苏北盆地富民油田三垛组垛一段5,6砂层组(E2s51,E2s61)主要有辫状河道砂体、中弯度曲流河道砂体、高弯度曲流河道砂体3种沉积特征各异的砂体成因类型;受古沉积环境特别是古水动力条件的影响,这3种类型河道砂体的非均质性各具特点,且按一定的顺序呈有规律变化。 There are three sedimentary features of braided channel sandbody, middle-curved meandering channel sand body and high-crooked meandering channel sandbody in the first and second 5,6 or 4 sand layers (E2s51 and E2s61) in the Fumin Oilfield, Of the sand body genetic types; under the influence of paleo-sedimentary environment, especially Paleohydrodynamic conditions, the heterogeneity of the three types of channel sand bodies has its own characteristics and changes regularly in a certain order.