Angle‐domain common‐image gathers for migration velocity analysis by wavefield‐continuation imaging

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Comparison of methods for extracting ADCIGs from RTM (2014, methodology): “…receiver wavefields (e.g., Figure 3b), that are shifted relative to each other in the space/frequency domain (Sava and Fomel, 2003, 2005a, 2005b; Biondi and Symes, 2004), expressed as Iðx; hÞ ¼ s ω Usðx − h;ωÞU* rðx þ h;ωÞ; (23) where h ¼ ðhx; hzÞ is a shift vector, in the x and z space…”
Simultaneous inversion of full data bandwidth by tomographic full-waveform inversion (2014, neutral): “To address this limitation we could use the vertical subsurface oﬀset in addition to the horizontal ones (Biondi and Symes, 2004), but the computational cost would increase accordingly.”
An overview of full-waveform inversion in exploration geophysics (2009, methodology): “…the motivation behind a two-step workﬂow: construct the macromodel using kinematic information, and then the amplitude projection using different types of migrations (cid:1) Claerbout and Doherty, 1972; Gazdag, 1978; Stolt, 1978; Baysal et al., 1983; Yil-maz, 2001; Biondi and Symes, 2004 (cid:2) .”
Coordinate-independent Angle-gathers For Wave Equation Migration (2005, methodology): “The components of the h vectors are the two conventional horizontal offsets, hx andhy (Rickett and Sava, 2002), and a vertical offset hz (Biondi and Symes, 2004).”