Abstract: In most petroleum-bearing basins of China，the lithologies of continental deposition strata are complex. The overlapping
ranges of acoustic impedance values of different lithologies lead to the non-uniqueness of lithological seismic interpretation.
Rapid change of fluvial energy，high frequency of transgression and regression contribute to the wide development of thin
inter-bedding. The interferences between thin inter-bedding are universal，which affect the precision of seismic interpretation.
Aiming at the complex lithology-acoustic impedance relationship，the difficulties of traditional seismic reservoir prediction
methods in identifying complex lithologies have been analyzed systematically. Also，according to the geophysical response
features of the complex lithologies，the sensitive well logging parameter of identifying complex lithologies is chosen. The
ninety-degree phasing of seismic traces in a relative impedance sense is selected to serve as a constrained role in well logging
parameter inversion. The result shows that this method is capable of recognizing complicate lithologies efficiently and the goal
of explicit reservoir characterization in complex lithologies area can be obtained.

Key words: complex lithologies area, well logging parameter inversion, ninety-degree phasing of seismic traces, lithologyrecognition