Application of Reverse Time Migration to Complex North Sea Imaging

Jones, Ian F.; Sugrue, M.J.; King, D.; Goodwin, M. C.; Berranger, Ivan; Zhou, Hongbo; Farmer, Paul

doi:10.3997/2214-4609.201401525

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Time Migration Pitfalls1

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2014

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“…When migrated inappropriately, complex arrivals in the data (such as double bounces and through-salt reflection travel paths) can produce what appears to be a false "base salt" in the diapir image. In Figure 11a, conventional migration of these synthetic data produced a false allochthonous base-salt image and a similar result is observed on the real North Sea data example shown in Figure 11b (Jones et al, 2006). Subsequent migration of these data using RTM with an appropriate velocity model produced an image with the salt stem (Farmer et al, 2006).…”

Section: Time Migration Pitfallssupporting

confidence: 64%

Seismic imaging in and around salt bodies

Jones

Davison²

2014

Interpretation

171

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Seismic imaging of evaporite bodies is notoriously difficult due to the complex shapes of steeply dipping flanks, adjacent overburden strata, and the usually strong acoustic impedance and velocity contrasts at the sediment-evaporite interface. We consider the geology of salt bodies and the problems and pitfalls associated with their imaging such as complex raypaths, seismic velocity anisotropy, P-and S-wave mode conversions, and reflected refractions. We also review recent developments in seismic acquisition and processing, which have led to significant improvements in image quality and in particular, reverse time migration. We tried to call attention to the form, nature, and consequences of these issues for meaningful interpretation of the resulting images.

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Section: Time Migration Pitfallssupporting

confidence: 64%