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Prestack data enhancement with phase corrections in time‐frequency domain guided by local multidimensional stacking
Author(s) -
Bakulin Andrey,
Neklyudov Dmitri,
Silvestrov Ilya
Publication year - 2020
Publication title -
geophysical prospecting
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.735
H-Index - 79
eISSN - 1365-2478
pISSN - 0016-8025
DOI - 10.1111/1365-2478.12956
Subject(s) - stacking , computer science , masking (illustration) , data processing , signal processing , phase (matter) , signal (programming language) , algorithm , regional geology , reflection (computer programming) , environmental geology , economic geology , field (mathematics) , frequency domain , geology , physics , seismology , telecommunications , mathematics , nuclear magnetic resonance , computer vision , metamorphic petrology , art , radar , quantum mechanics , pure mathematics , visual arts , tectonics , programming language , operating system
We present a new approach to enhancing weak prestack reflection signals without sacrificing higher frequencies. As a first step, we employ known multidimensional local stacking to obtain an approximate ‘model of the signal’. Guided by phase spectra from this model, we can detect very weak signals and make them visible and coherent by ‘repairing’ corrupted phase of original data. Both presented approaches – phase substitution and phase sign corrections – show good performance on complex synthetic and field data suffering from severe near‐surface scattering where conventional processing methods are rendered ineffective. The methods are mathematically formulated as a special case of time‐frequency masking (common in speech processing) combined with the signal model from local stacking. This powerful combination opens the avenue for a completely new family of approaches for multi‐channel seismic processing that can address seismic processing of land data with nodes and single sensors in the desert environment.