Time-frquency analysis of seismic reflection data 

P. Steeghs and G.G. Drijkoningen 

		ABSTRACT
In this paper we show the implementation of bilinear time-frequency 
representations in the interpretation of seismic data. 
In seismic stratigraphy the reflection patterns in seismic data are 
interpreted in terms of subsurface stratification and lithological 
properties. The time-frequency representation elicits seismic 
reflection patterns and can thus provide useful information on 
subsurface stratification. 
A comparison of several $t-f$ representations shows that the best 
results, from an interpretational point of view, can be obtained 
with a kernel that is adapted to the characteristics of the signal  
uuder analysis. 
We demonstrate that considerable improvement upon an existing method
for seismic data analysis, complex-trace attribute analysis, 
can be achieved. The local frequency that is extracted from 
the $t-f$ representation provides a better picture of the spectral 
variation in the data than the instantaneous frequency, that was 
obtained from the analytic signal.