Superresolution Imaging with Resonance

ScatterringGerard Schuster, Yunsong Huang, and Abdullah

AlTheyabKing Abdullah University of Science and Technology

Question: Dx << l/2?Migration: Dx=lz/4L LSM: Dx=l/2 Non-Linear LSM: Dx<<l/2

7 km

Outline

Summary

Question: Dx << l/2?

Answer: Dx=l/(4N+2)

Synthetic Testsvs

Field Data Tests

vs

Primary Resolution and ZO MigrationWhere is the Scatterer?

T

l/2=DxWhere did this come from?

Where did this come from?

Where did this come from?

Q: How thick is primary donut?: A l/2 (one roundtip)

2nd-order multiple

Primary Resolution and ZO MigrationWhere is the Scatterer?

T

Resonance Resolution and ZO MigrationWhere is the Scatterer?

1st-order multiple

Assume two interfaces, where we know location of one.

?Q: How thick is 1st order donut?: A l/4 (two roundtips)

Where is the other?

Q: How thick is 2nd order donut?

: A l/6 (three roundtips)

Question: Dx << l/2?

Answer: Dx=l/(2N+2)

Outline

Summary

Question: Dx << l/2?

Answer: Dx=l/(4N+2)

Synthetic Testsvs

Field Data Tests

vs

1-Bounce Migration 3-Bounce Migration

1-Scatterer ModelAssume perfect natural multiple migration operator, isolated multiples

6-Scatterer Model1-Bounce Migration 3-Bounce Migration

0.7 km

Assume we know locationsOf outer ring of scatterers

Outline

Summary

Question: Dx << l/2?

Answer: Dx=l/(4N+2)

Synthetic Testsvs

Field Data Tests

vs

Top of Salt

P

sea floor

top of salt

Primary Migration MResonance Migration

Advantage: gain in vertical resolutionSuperresolution by Resonant Multiples

Disadvantage: short-offset data only

Summary

kx

kg + ks

Reconstructed Model Spectrum

Dx=l/(2N+2) N-bounce Resonance

vs

Slight change in scatterer position amplified arrival

time+Superresolution

kz

vs

Primary top of salt Resonance top of salt

kz

kx

kz1st-order resonant multiples

SummaryLimitations Limited range of resonance wavenumbers for specular reflections Resonance can be very weak

Separation of different orders of resonance