On the basis of gas reservoirs in Shengtuo oilfield being characterized by shallow reservoir distribution

simple structure and good-quality seismic data

three parameters

amplitude

instantaneous frequency and instantaneous phase have been used and integrating with drilling data to analyze the corresponding relation between these parameters and the known gas-bearing formations.The gas-bearing interval showed while drilling has a strong amplitude in the amplitude profile

a low frequency in the instantaneous frequency profile

and phase reversal in the instantaneous phase profile. By using these characteristics

the southeastern part of Shengtuo oilfield has been predicted to be a favourable gas reservoir area.