As the development well pattern is successively encrypted, the distribution trend of reservoir sand bodies is gradually clear. In the vertical direction, sand bodies can be accurately identified according to logging data, but in the horizontal direction, it is difficult to determine the distribution characteristics of sand bodies between wells. In order to solve the difficult problem that identifying single sand bodies on a continuous well profile is large workload and involves multiple solutions, the technique of well seismic combined with inversion technology is proposed to achieve the fine characterization of single sand body in the complex meander zone. A single sand body characterization method of “logging determine phase, pattern determine shape, inversion determine boundary” is formed. Based on this idea, the abandoned river channel and single river channel in unit B1 of block Y are identified. The research results are of great significance to the establishment of fine geological models, the adjustment of well pattern and the exploitation of remaining oil.