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Paper Information

Title: 

SINGLE-FREQUENCY BASED SEISMIC ATTRIBUTE USING CONTINUOUS WAVELET TRANSFORM

Type: PAPER
Author(s): ZABIHI EHSAN,SIYAHKOHI HAMIDREZA
 
 
 
Name of Seminar: CONFRANCE ZHEOFIZIKE IRAN
Type of Seminar:  CONFERENCE
Sponsor:  ANJOMANE MELI ZHEOFIZIK IRAN
Date:  2006Volume 12
 
 
Abstract: 

SPECTRAL DECOMPOSITION IS A POWERFUL TOOL FOR ANALYSIS OF SEISMIC DATA. FOURIER TRANSFORM DETERMINES THE FREQUENCY CONTENTS OF A SIGNAL. BUT FOR ANALYZING OF A NON-STATIONARY SIGNAL, 1-D TRANSFORM TO FREQUENCY DOMAIN IS NOT SUFFICIENT. IN EARLY YEARS, TRANSFORMING OF SEISMIC TRACES INTO TIME AND FREQUENCY DOMAIN WAS DONE VIA WINDOWED FOURIER TRANSFORM, SO CALLED A SHORT TIME FOURIER TRANSFORM (STFT). THE LENGTH OF THE SELECTED WINDOW IN STFT WAS CONFINED THE RESOLUTION OF THE RESULTS IN TIME-FREQUENCY DOMAIN. CONTINUOUS WAVELET TRANSFORM (CWT) WAS A REMEDY TO SOLVE THIS PROBLEM BY USING THE SCALEABLE WAVELETS. THE SCALE IN CWT IS RELATED TO THE FREQUENCY BANDWIDTH OF THE WAVELET AND ITS CONVERSION TO FREQUENCY YIELD TIME-FREQUENCY MAP WHICH IS COMPARABLE TO THE TIME-FREQUENCY MAP OBTAINED FROM STFT. IN THIS STUDY, WE APPLIED CWT ON A SEISMIC SECTION AND EXTRACTED A SINGLE FREQUENCY SEISMIC SECTION FROM THE RESULTED CUBE. THE EXTRACTED SECTIONS WERE USED TO DETECT LOW FREQUENCY SHADOW OF THE HYDROCARBON RESERVES OVER THE STUDY AREA AS WELL AS ANALYZING THE EXISTING THIN LAYERS ON A SYNTHETIC SEISMIC SECTION.

 
Keyword(s): CWT, TIME-FREQUENCY DOMAIN, SEISMIC ATTRIBUTE, STFT, THIN LAYER, LOW FREQUENCY SHADOW, SPECTROGRAM, SCALOGRAM
 
 
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