T Oilfield is a typical complex fault block oilfield in Haita area, which has the geological characteristics of multiple fault blocks, small scale, multiple sources and fast phase change, and is now in the middle and late stages of development, so it is necessary to establish a fine and effective method to depict sand bodies, ensure the accuracy of sand body distribution characteristics, and consolidate the geological foundation. Based on the previous research results, the driving mechanism of sediments from provenance to convergence is analyzed by integrating sedimentary environment and paleogeomorphology characteristics with modern sedimentation, and the sedimentary model of sand bodies in T Oilfield is established. Then the wave impedance curve reconstruction technology is established, and the waveform indication inversion sand body prediction is carried out. Finally, the sedimentary model is used as a framework guide, and the sand body prediction results are used as a boundary constraint. The main sand body step by step depiction technology is formed to finely depict the distribution characteristics of the main sand body in N1 formation of T Oilfield, so as to effectively guide the development adjustment and efficient potential tapping of T Oilfield and improve the recovery percent of the oilfield.