Abstract: In view of thin reservoir prediction and sand body facies line identification, which are the key points of lithologic reservoir description, based on the in-depth analysis of the seismic and geological difficulties and technical status of thin reservoir prediction in Yudong area, the technical ideas of thin reservoir prediction in this area are put forward. That is to say, by using the reprocessed 3 D seismic data, combining with the seismic wavelet decomposition and reconstruction technology, stratigraphic slicing technology and seismic waveform indication inversion technology based on quasi-wave group resistance, and combined with the well and seismic data, the spatial distribution of sandstone in Paleogene 3 sand formation is predicted again. In combination with drilling and structure, the plane distribution of lithologic gas reservoir in Paleogene 3 sand formation is characterized, and the scale of new reserves is predicted.