1. Migration Resolution

2. Fresnel Zone T/2 L z z zL 2

3. 1-way time (x-x ) + y 22 2c2c2c2c s rsrsrsrs =  rsrsrsrs + T o ZO Migration ZO Migration Smear Reflections along Fat Circles Smear Reflections along Fat Circlesxs r d(x, )  rsrsrsrs s

4. 1-way time ZO Migration ZO Migration Smear Reflections along Fat Circles  rsrsrsrs d(x, ) s  x & Sum

5. 1-way time ZO Migration ZO Migration Smear Reflections along Circles  rsrsrsrs d(x, ) s  r & Sum

6. ZO Migration Resolution ZO Migration Resolution Intersection of Fresnel Zones Vertical Res. = Near-Offset Traces

7. ZO Migration Resolution ZO Migration Resolution Intersection of Fresnel Zones Horiz. Res. = Far-Offset Traces

8. Why is Pt. Scatterer Response of Migration Why is Pt. Scatterer Response of Migration a Blurred Version of Point? Migration: m = L d TMigratedSectionData but d = L r L rL rL rL r Migration Section = Blured Image of r

9. 0 km 7 km 0 km 3 km

10. Conclusions LSM:LSM: m = (L L) L d m = (L L) L dTT.. x d(x, ) A(x,x’)  xx’ = m(x’) Smear reflections along fat circles Far-Offset Traces = Better Hor. Res.Far-Offset Traces = Better Hor. Res. Near-Offset Traces = Better Vert. Res.Near-Offset Traces = Better Vert. Res. m = L d m = L dT ZO Migration:ZO Migration: m = (L L) rm = (L L) rT