3-D Effects

In each example presented in this chapter the final migrated image (Figures 15 and 20) still seemed to show room for improvement. The top of the salt was not well defined, especially around x=7 km. We were not able to see the left salt edge and the reflectors did not extend as far as anticipated. Figure 21 shows some of the reason. The front panel shows the same cross-line location used in this chapter. The right panel shows a cross-line view of the structure along the upper salt top. The complicated cross-line structure means that a 2-D method has little chance of either finding the correct velocity or properly imaging. Reflectors below the salt edge are also effected by this 3-D structure. In chapter  I show how many of these problems are solved when the problem is addressed in a 3-D context.

 

3deffect
Figure 21 The front panel shows the same cross-line location used in this chapter. The right panel shows a cross-line view of the structure along the upper salt top. The complicated cross-line structure means that a 2-D method has little chance of either finding the correct velocity or properly imaging.