FIELD: physics; geophysics.
SUBSTANCE: invention relates to geophysics and can be used to process seismic survey data. A method for reconstructing subsurface Q models (110) from seismic data (10) by performing ray-based (60), centroid frequency shift (50) Q tomography is disclosed. The amplitude spectrum of the seismic source waveform is approximated (40) by a frequency-weighted exponential function of frequency, having two selected parameters to adjust the frequency shift data, thereby providing a better fit to various asymmetric source amplitude spectra. Box constraints may be used in the optimisation procedure, and a multi-index active-set method used in velocity tomography is a preferred technique for implementing the box constraints (100).
EFFECT: high accuracy of seismic survey data.
20 cl, 12 dwg
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