Is Superresolution by RTM Achievable?

Tucson, Arizona Test

T u n n el a t lev e l 2(3 0 m fro m g ro u n d )

T u n n el a t lev e l 3(4 5 m fro m g ro u n d )

Sh

aft G rou n d S u rface3 0 m

1 5 m

S h o t lo ca tio n

R ece iv e r lo ca tio n

S h aft en tran ce

60 m

Poststack Migration

1 0 1 2 1 4 1 6 1 8 2 0 2 2 2 4 2 6 2 8 3 0X (m )

-0 .2

0

0 .2

0 .4

0 .6

0 .8

1

Nor

mal

ized

Am

pli

tud

e

D ire c t - F u ll A p ra tu reD ire c t - H a lf A p ra tu reS c a tte re rs - F u ll A p ra tu reS c a tte re rs - H a lf A p ra tu re

S u p er-reso lu tio n T est - P o in t # 1 4 a t X = 2 4 m

~Kirchhoff Mig.

~Scattered RTM

This is highest fruit on the tree..who dares pick it?

(Hanafy et al., 2008)

Can Scatterers Beat the Resolution Limit?

Recorded Green’s functions G(s|x) divided into:

- Shot gathers with direct arrivals only

- Shot gathers with scattered arrivals only

0 2 0 4 0 6 0 8 0 1 0 0 1 2 0

D ista n ce (m )

0 .5

0 .4

0 .3

0 .2

0 .1

0T

ime

(ms)

G reen 's F u n ctio nA fter b a n d -p a ss filter

0 2 0 4 0 6 0 8 0 1 0 0 1 2 0

D ista n ce (m )

0 .5

0 .4

0 .3

0 .2

0 .1

0

Tim

e (m

s)

G reen 's F u n ctio nA fter b a n d -p a ss filter

0 2 0 4 0 6 0 8 0 1 0 0 1 2 0

D ista n ce (m )

0 .5

0 .4

0 .3

0 .2

0 .1

0

Tim

e (m

s)

G reen 's F u n ctio nA fter b a n d -p a ss filter