Abstract: Sequence division of Shahejie Formation is very significant for searching for lithologic and stratigraphic traps in Huanxiling area, western Liaohe Sag. However, the seismic reflection characteristic of seismic data shows indistinctly, identification of sequence boundary is difficult. By utilizing the principle and method of classic sequence stratigraphy and studying seismic and well logging data, in virtue of seismic time-frequency analysis and logging continuous wavelet transformation, sequence boundary is confirmed. Study indicates seismic time-frequency analysis and logging continuous wavelet transformation is relatively credible and practical. Shahejie Formation in Liaohe western Sag develops 5 isochronic sequence boundaries and can be divided into six level-three sequences.

Key words: Shahejie Formation, time-frequency analysis, continuous wavelet transformation, sequence stratigraphic framework, Liaohe Basin