A depth migration method based on the full‐wave reverse‐time calculation and local one‐way propagation

Abstract

A depth migration method combining the full-wave reverse-time calculation and local one-way propagation is proposed. The full-wave finite-difference propagator is used to extrapolate the source and receiver waves in the model. The wavefields are extracted from selected locations and then a local one-way propagator is used to extrapolate the wavefield towards different directions. The one-way propagator is also served as a one-way filter, separating waves propagating along different directions. Finally, the image is calculated from directional waves generated by the one-way propagator and the artifacts from backscattered waves of both source and receiver sides are effectively eliminated. This method also dramatically reduces the size of output files which is important when dealing with large 3D models.

Linearized inverse scattering based on seismic reverse time migration

“…If (x, ξ) is associated with a source ray, i.e. ξ = |ξ| n s (x), then ζ = 0 by (48). In that case there is no reflection.…”

“…As an intermediate result, we also obtain a new variant of the so called excitation time imaging condition in Theorem 5. Moreover, we also address the relation with RTM "artifacts" [49,30,19,48,22], as well as certain simplifications that occur when dual sensor streamer data are available.…”

Mathematische Methoden in der Geothermie

“…[13,70,84]), Tiefenfortsetzung (siehe z.B. [17,19,89]), Reverse Time Migration (RTM) (siehe z.B. [4,14,42,81]).…”

One-way wave propagation with amplitude based on pseudo-differential operators

“…They are also used in other fields such as underwater acoustics and integrated optics. One of the reasons to use these equations is that they provide wave field extrapolation in a certain direction [10]. Another reason to use these equations is the fact that they can be implemented cost efficiently [11].…”