The well-logging signal pretreatment is the first requirement for the sake of a better joint inversion of seismic and well-logging data.

The definition of wavelet analysis was introduced and the applicability of the logging data wavelet analysis by means of the high resolution sequence stratigraphy stratum was discussed.

A new method of division and correlation of glutenites sedimentary cycles based on the base-level restoration using wavelet transform of logging data was preliminarily put forward according to geological setting and composite base-level principle.

The wavelet scale is then used to perform wavelet transform on logging signals of unknown marked beds and the resulting transformed sequence are sorted by singular values to form groups containing candidate marked bed segments.

A logging signal acquisition and processing system based on DSP is developed.

But there are several limitations in the logging signal of our application:the SNR of the signal is very low and is contaminated by the noise;with low vertical resolution,it can t meet the refined thin layer division and contrast;cryptic period and the mutation point weren t so clear,and the manual judgment and explanation is with too much subjective randomness.