Time-frequency analysis of seismic data has various processing and interpretation applications in geophysical studies. Providing a time-frequency representation with better resolution results in more accuracy in the applications. In this paper, a new technique for time-frequency analysis of seismic data with high resolution called as synchroextracting transform (SET) is used. SET retains the time-frequency energy, provided by short-time Fourier transform, around the extracted instantaneous frequency and eliminates the extra energy elsewhere and by this way the resolution is increased. The performance of this method has been shown in providing high resolution time-frequency representation through some experiments on synthetic seismic and non-seismic signals. Also, this method has been used to detect the low-frequency shadow related to a gas reservoir. The results showed that the synchroextracting transform has an acceptable performance in the considered seismic application.