Oolitic shoal reservoirs of the Triassic Feixianguan Formation is one of the important oil and gas reservoirs in Sichuan Basin. The reservoir of Feixianguan Formation in Jiulongshan area is about 5 000 m deep, which has the geological background of multi-stage bioclastic shoal deposition. However, the thickness of the reservoir is thin, and the resolution of existing seismic data is relatively low, so it is difficult to accurately predict the spatial distribution of oolitic shoal reservoir, which restricts the gas exploration of Feixianguan Formation in this area. In this paper, the high-resolution three-dimensional seismic data are obtained by using the frequency expansion processing technology. On this basis, the spatial distribution of thin oolitic shoal reservoir of Feixianguan Formation in Jiulongshan area is effectively predicted and depicted by using the technologies of gamma inversion and frequency decomposition impedance inversion. The reservoir prediction results are in good agreement with the actual drilling, which proves that the technologies are practical and effective in the prediction of thin oolitic shoal reservoir.