Marchenko wavefield redatuming, imaging conditions, and the effect of model errors
Sjoerd Ridder (The University of Edinburgh)
J.R. Van der Neut (TU Delft - Applied Geophysics and Petrophysics)
A Curtis (The University of Edinburgh)
Kees Wapenaar (TU Delft - Applied Geophysics and Petrophysics)
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Abstract
Recently, a novel method to redatum the wavefield in the sub-surface from a reflection response measured at the surface has gained interest for imaging primaries in the presence of strong internal multiples. A prerequisite for the algorithm is an accurate and correct estimate of the direct-wave Green's function. However, usually we use an estimate for the direct-wave Green's function computed in a background velocity medium. Here, we investigate the effect of amplitude and phase errors in that estimate. We formulate two novel imaging conditions based on double-focusing the measured reflection response inside the subsurface. These yield information on the amplitude error in the estimate for the direct-wave Green's function which we can then correct, but the phase error remains elusive.