Seismic Time-Frequency Analysis Based on Time-Reassigned Synchrosqueezing Transform

Abstract

In this paper, we propose a novel seismic time-frequency analysis method via the time-reassigned synchrosqueezing transform (TSST), in which the time-frequency coefficients are reassigned in the time direction rather than in the frequency direction as the short-time Fourier-based synchrosqueezing transform (FSST) does. Such a technique can not only produce a highly concentrated time-frequency representation (TFR) for a wide variety of strongly frequency modulated signal, but also allow for the reconstruction of the modes with a high accuracy. Numerical experiments on synthetic signal and field data demonstrate the effectiveness of this new method, and show that the proposed method is more suitable for extracting seismic time-frequency feature and identifying the thin layers compared with the traditional FSST, which offers the potential in highlighting subtle geological structures.

Keywords

• Time-reassigned synchrosqueezing transform
• time-frequency representation
• time localization
• frequency slice