Introduction - 3-D Seismic Interpretation - page 6

(a)

Strike line
(perpendicular to paper)

Dip line

Normal incidence ray

Strike section Dip section

Stack
Migration

(b)

500 m

Fig. 1.3 (a) For a 2.5-D structure, dip and strike lines do not tie after migration; (b) map view of
reflection points for a 2-D line (contours are depth in feet (ft)).

means that events are correctly positioned in the 3-D volume (provided that the
migration process has been carried out with an accurate algorithm and choice of pa-
rameters, as discussed further in chapter 2 ) . This is an enormous advance for mapping
of complex areas; instead of a grid of lines that do not tie with one another, we have a