Time-shift imaging condition in seismic migration |

(22) |

Relation (23) can be interpreted using ray parameter vectors at image locations (Figure 2).

img3
Interpretation of angle-decomposition based on equation (23)
for time-shift gathers.
Figure 2. |
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Equation (23) can be written as

where are partial derivatives of relative to . We can rewrite equation (25) as

where denote partial derivative of coordinate relative to coordinates and , respectively. Equation (26) describes an algorithm in two steps for angle-decomposition after time-shift imaging: compute through a slant-stack in panels (find a change in with respect to ), then apply a correction using the migration slowness and a function of the structural dips .

Time-shift imaging condition in seismic migration |

2013-08-29