Abstract: The point bar of coastal offshore environment and the deposition under offshore sheet sand are developed in ZJ1-2L oil group reservoir of Wenchang A Oilfield.The development of this oilfield is seriously constrained by its few wells,few typical seismic facies indexes,the gradual westward thinning of the reservoir until the thickness is smaller than the seismic data resolution and the difficult determination of the sandbody boundary.As the conventional reservoir prediction techniques cannot solve such problems,the paper adopts seismic sedimentology techniques to characterize the sandbody border.The time deposit reference plane is determined by the frequency division interpretation technology.According to the Wheeler transformation,a series of stratigraphic sections based on sequence stratigraphic isochronous trellis are established.The plane distributions of the sandbodies in different periods are presented by the interpretation of strata slices and domain play observation.The combination of frequency division inversion technique is applied based on above techniques and successfully achieves the fine description of reservoir distribution.The development and implementation results show the research results have a good coincidence in drilling data.