Geoscience Reference
In-Depth Information
Thickness (ft)
0
10
20
40
50
60
70
80
90
100
(a)
(b)
Fig. 4.1
(a) Wedge model for bandwidth 6-60 Hz; (b) model for calculating thin bed response
from the difference of identical wavelets slightly displaced in time, redrawn after Widess
(1973)
with permission of the SEG.
frequencies in the range 8-150 Hz; the upper frequency limit will be reduced as the
seismic signal propagates through the earth, perhaps to about 50 Hz at a TWT of 2 s.
The effect of finite bandwidth can be studied using a simple model
(fig. 4.1(a))
. This
shows the zero-offset response to a wedge of material increasing in thickness from zero
