Summary of domains of migration algorithms

From SEG Wiki
Jump to: navigation, search
Seismic Data Analysis
Seismic-data-analysis.jpg
Series Investigations in Geophysics
Author Öz Yilmaz
DOI http://dx.doi.org/10.1190/1.9781560801580
ISBN ISBN 978-1-56080-094-1
Store SEG Online Store


Migration algorithms described in this section are based on the assumption that the input stacked section represents a zero-offset acoustic wavefield. As such, these algorithms are all based on the scalar wave equation (12). Table 4-6 provides a list of the migration algorithms described in this section with the associated design and application domains. While there exist several other migration algorithms, those listed in Table 4-6 are the most widely used in practice.


(12)

Also included in Table 4-6 are the types of velocity fields and dips each migration algorithm can accommodate. It is clear that each algorithm is limited by either the type of velocity variations or dip ranges. Therefore, each has an appropriate usage in practice depending on field data and velocity characteristics (introduction to migration). Note that the lateral velocity variations implied by the velocity fields in Table 4-6 are mild to moderate and are within the bounds of time migration. Additionally, the choice of migration algorithm depends on whether your objective is imaging or migration velocity analysis. While imaging is the subject of this chapter, migration velocity analysis is discussed in dip-moveout correction and prestack migration.

Table 4-6. Domains of migration algorithms.
Algorithm Domain Dips and Velocities
Kirchhoff summation t − x time-space up to 90 deg rms v(x, τ)
Finite-Difference 15-deg Implicit t − x time-space up to 35 deg int v(x, τ)
Finite-Difference 45-deg Implicit ω − x frequency-space up to 65 deg int v(x, τ)
Finite-Difference 70-deg Explicit ω − x frequency-space up to 80 deg int v(x, τ)
Phase-Shift ω − kx freq.-wavenumber up to 90 deg int v(τ)
Stolt Method with Stretch ω − kx freq.-wavenumber up to 90 deg rms v(x, τ)

See also

External links

find literature about
Summary of domains of migration algorithms
SEG button search.png Datapages button.png GeoScienceWorld button.png OnePetro button.png Schlumberger button.png Google button.png AGI button.png