Based on the characteristics of reef flat reservoir and its distribution interpreted by the seismic reflection features, various forms of frequency information are applied to predict the reservoir distribution. The main influencing factors for the change of seismic wave frequency are expounded, and the practicability for identifying the hydrocarbon potantial in carbonate reef flat reservoirs by frequency information is analyzed. Several parameters which could display the frequency features are selected, including single low frequency, dominant frequency, frequency attenuation gradient, high-low frequency energy radio and instantaneous frequency. As a kind of carbonate reef flat lithologic reservoir, the gas reservoir in LY area is characterized by deep burial depth and nonuniform oil and gas distribution. The application shows that the result of oil and gas distribution prediction by using different frequency information is consistent with drilling data, and the reservoir lateral variation could be well reflected.