During analyzing the seismic facies of Qiketai(Qkt) Formation in Pubei(Pb) area with Stratimagic software

we compared the application conditions of waveform classification technique.Seismic data with a frequence greater than 40 Hz and a signal-to-noise ratio greater than 25 DB are suitable for seismic waveform classification.The effect of waveform analysis is good in area with gentle structural attitude and under-developed fractures.Furthermore

the selection of suitable seismic time window and the setting of proper waveform classification number also affect the application effect of waveform classification technique.Generally

a waveform classification number of five to eight is reasonable

which match well with the sedimentary microfacies types.This technique is used to map the sedimentary microfacies of Qkt Group.Comparison with single well sedimentary microfacies identification shows that the coincidence rate is more than 86%

verifying the reliability of sedimentary microfacies prediction by using seismic waveform classification technique.Finally

this paper presents the sandstone distribution predicted by using this technique which can be used to guide future exploration of subtle reservoirs in the area.