Interpretation of Seismic Data from Permian – Mesozoic Polish Basin in the Time and Frequency Domain

The aim of the project was to analyse the application of chosen seismic attributes and spectral decomposition for interpretation of under - Zechstein reflections on the seismic sections from the Golce region. The main objective of the work was thickness estimation of the thin, sandstone layer which lays within the Rotliegend formation. Mainly instantaneous and geometrical attributes which are available in OpendTect were used. Two approaches of spectral decomposition were applied: based on Fast Fourier Transform (FFT) and Contonous Wavelet Transform (CWT). FFT is the best choice for thickness estimation, but it is very sensitive to the length of the time window. CWT is independent of the time window and has good resolution for high and low frequencies, because the length of the window varies with time. The results of thickness estimation based on FFT were verified with the data from the well Golce-1. The estimated thickness matches nicely with the data from the well. Additionally, results of instantaneous frequency show some similarities with the results of spectral decomposition.