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Migration Resolution. Fresnel Zone. T/2. L.  z. 2. L. z. ZO Migration Smear Reflections along Fat Circles. . . r s. + T. r s. o. 1-way time. r. x. s. . 2. 2. (x- x ) + y. =. d( x , ). s. r s. 2 c. s. ZO Migration

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Migration resolution

Fresnel Zone

T/2

L

 z

2

L

z


Migration resolution

ZO Migration

Smear Reflections along Fat Circles

rs

+ T

rs

o

1-way time

r

x

s

2

2

(x-x ) + y

=

d(x , )

s

rs

2c

s


Migration resolution

ZO Migration

Smear Reflections along Fat Circles

rs

& Sum

1-way time

x

d(x , )

s


Migration resolution

ZO Migration

Smear Reflections along Circles

rs

& Sum

1-way time

r

d(x , )

s


Migration resolution

ZO Migration Resolution

Intersection of Fresnel Zones

Intersection of Fresnel Zones

Vertical Res. = Near-Offset Traces


Migration resolution

ZO Migration Resolution

Intersection of Fresnel Zones

Intersection of Fresnel Zones

Horiz. Res. = Far-Offset Traces


Migration resolution

Why is Pt. Scatterer Response of Migration

a Blurred Version of Point?

Lr

d = Lr

but

Migration:

Migration Section = Blured Imageof r

Migrated

Section

Data

T

m = L d


Migration resolution

0 km

3 km

0 km 7 km


Conclusions

T

-1

T

m = (L L) L d

x

T

  • ZO Migration:

m = L d

Smear reflections along fat circles

..

d(x, )

m(x’)

=

xx’

T

  • m = (L L) r

A(x,x’)

Conclusions

LSM:

  • Far-Offset Traces = Better Hor. Res.

  • Near-Offset Traces = Better Vert. Res.