Layer thickness estimation from the frequency spectrum of seismic reflection data

摘要

We compare the spectra of Short Time Window Fourier Transform (STFT) and Constrained Least Squares Spectral Analysis (CLSSA) for spectral minima periodicity. Using time thickness equals 1/df, where df is frequency period, we show that spectral minima approach using CLSSA gives more accurate time thicknesses than STFT for the same analysis window. Starting with a broad band synthetic seismic data generated from a wedge model, we extract selected traces at known temporal thicknesses for time frequency analysis. We cross plot apparent time thicknesses derived from CLSSA and STFT line spectra using the approach above, against true time thicknesses of the wedge model. The result shows apparent CLSSA thicknesses that are strongly correlated with true time thicknesses We extend this study to real seismic data from Hitts Lake Field, onshore Texas and show that the results are consistent with the results from model studies.