Annual Report 2000 - WIT

16
CDP number
3100 3000 2900 2800 2700 2600
30
CDP number
3100 3000 2900 2800 2700 2600
25
2.6
20
2.6
15
2.8
10
2.8
5
Time [s]
3.0
0
-5
Time [s]
3.0
3.2
-10
3.2
-15
3.4
-20
3.4
-25
3.6
Detail of optimized CRS stack section (ungained)
a)
-30
3.6
Difference of emergence angles [°]
b)
50
CDP number
3100 3000 2900 2800 2700 2600
50
CDP number
3100 3000 2900 2800 2700 2600
40
2.6
40
2.6
30
30
20
2.8
20
2.8
10
10
0
Time [s]
3.0
0
Time [s]
3.0
-10
3.2
-10
3.2
-20
-20
-30
3.4
-30
3.4
-40
-40
-50
3.6
Detail of 1st emergence angle section [°]
c)
-50
3.6
Detail of 2nd emergence angle section [°]
d)
Figure 6: Details of the CRS stack results: a) optimized CRS stack section, c) and d)
emergence angles of the first and second detected contributing events, b) difference of
the emergence angles shown in c) and d).
The steep event in the center of the figures intersects several conflicting events,
e.g., the plate boundary in the lower left. Depending on the chosen thresholds for the
identification of conflicting dip situations, the intersecting events were detected and
characterized. This can be seen best in Figure 6b with the difference of the emergence
angles in subfigures c and d.
Although the multitude of (actually only sparsely covered) attribute sections is
difficult to visualize, we can easily make full use of them to simulate the final ZO
section including the interference of intersecting events. Furthermore, the approximate
time migration included in the current implementation handles all contributing events
separately. In contrast, the conventional post-stack time migration is not able to resolve
such ambiguities as its input only contains the superposition of all contributing events.