Data Background

The data were recorded by WesternGeco in 1999, as part of a multi-client (non-exclusive) survey which acquired a coarse grid of ten 2-D lines. A single 2-D line, consisting of 2943 shots covering roughly 120 km, was donated to SEP. The survey used the following acquisition parameters:

• Shot interval: 25 m
• Group interval: 12.5 m
• Number of channels: 912
• Active array length: 11.4 km
• Near offset: 185 m
• Record length: 9.8 sec at 4 msec

Wave equation migration was applied to the data by ().

 

coff
Figure 1 Near-offset section. Top of basalt (and its multiples) is most prominent sub-water bottom reflection.

 

cmps
Figure 2 Three common-midpoint gathers selected along the line.