Title :
Reduction of dispersive ground-roll using time delay spectrometry
Author :
Moller, Peter K. ; Larsen, Henrik C.
Author_Institution :
Electron. Inst., Tech. Univ. of Denmark, Lyngby, Denmark
Abstract :
Velocity filtering seismic traces requires fulfilment of the sampling theorem in the time domain and in the space domain. Since the latter condition is seldom met in exploration seismics, a method based on τ-p transformation combined with time varying filtering is proposed for solving the problem of reducing dispersive ground-roll in a seismic trace. Although it is possible to mask out ground-roll in the τ-p domain, mapping of the τ-p domain back into the original x-t domain involves numerical difficulties because the used inverse discrete Radon transform is ill-posed. To circumvent this problem the seismic trace is applied to a time varying filter with a stop-band which at any instant corresponds to the instantaneous frequency of the ground-roll, thus reducing the ground-roll with minimum distortion of the wanted seismic rate
Keywords :
delays; filtering and prediction theory; geophysical prospecting; geophysical techniques; seismology; spectrometers; τ-p transformation; dispersive ground-roll; exploration seismics; instantaneous frequency; inverse discrete Radon transform; prospecting; sampling theorem; seismic rate; seismic trace; seismology; space domain; stop-band; technique; time delay spectrometry; time domain; time varying filtering; Delay effects; Discrete transforms; Dispersion; Filtering; Filters; Frequency; Geology; Reflection; Sampling methods; Spectroscopy;
Conference_Titel :
Acoustics, Speech, and Signal Processing, 1992. ICASSP-92., 1992 IEEE International Conference on
Conference_Location :
San Francisco, CA
Print_ISBN :
0-7803-0532-9
DOI :
10.1109/ICASSP.1992.226266