Overview of SEP research Paul Sava

The problem Modeling operator Seismic image Seismic data

Migration Migration operator Seismic image Seismic data

Migration operator: wavefield propagation Downward continuation –Common-azimuth migration –Narrow-azimuth migration Reverse time migration Propagation Imaging Amplitudes Velocity

Downward continuation Narrow- azimuth Common- azimuth Biondi, 2003

Reverse-time migration Biondi & Shan, 2002 Downward- continuation Reverse-time migration

Migration operator: angle-gathers Data-space Prucha et al Image-space Sava&Fomel, Tisserant&Biondi (S-G) Rickett&Sava (shot profile) Rosales&Rickett (converted waves) Biondi&Shan (reverse-time) Propagation Imaging Amplitudes Velocity

Prucha et. Al (1999), Sava&Fomel (2002) Angle-domain common image gathers Data-space ADCIG Image space ADCIG

3-D angle gathers Tisserant & Biondi (2003)

Migration operator: amplitudes Amplitude preserving wavefield extrapolation Sava & Biondi Amplitude corrections of extrapolation operators Vlad et. al Hi resolution imaging condition Valenciano & Biondi Propagation Imaging Amplitudes Velocity

Amplitude-preserving migration Sava & Biondi (2002) Amplitude preserving Kinematic migration

Migration operator: velocity Traveltime-based Clapp Wavefield-based Sava & Biondi Propagation Imaging Amplitudes Velocity

Angle-domain traveltime tomography Clapp (2001)

Tomography: geological constraints Clapp (2001)

Wave-equation MVA Slowness perturbation Image perturbation Sava & Biondi (2003)  z  z xx

Wave-equation MVA Sava & Biondi (2003)

Multiple attenuation –Data space –Image space Multiple imaging Joint imaging

Time (s) Input data Hyperbolic Radon Adaptive filtering Pattern recognition Multiple attenuation: data space Guitton (2003)

PRT image space HRT data space Multiple attenuation: image space Sava & Guitton (2003)

Multiple imaging Multiple attenuation –Data space –Image space Multiple imaging Joint imaging

Multiple imaging: shot-profile migration Guitton (2002) Up-going wavefield Down-going wavefield PrimariesImpulse Up-going wavefield Down-going wavefield MultiplesPrimaries Primaries imagingMultiples imaging

Multiple imaging: S-G migration Shan (2003)

Joint imaging Multiple attenuation –Data space –Image space Multiple imaging Joint imaging

Brown (2003) S G

Migration Migration operator Seismic image Seismic data

Inversion operator Least-squares imaging Seismic image Seismic data

Least-squares imaging Normalized migration Matching filters Least-squares inverse Multiple realizations Illumination compensation Rickett (2001) Prucha (2003)

Normalized migration Rickett (2003)

Least-squares imaging Guitton (2003) Normalized migration Matching filters Least-squares inverse Multiple realizations (L*L) data L* L*L B Find B such that

Imaging with mathching filters Guitton (2003)

Least-squares inverse Normalized migration Matching filters Least-squares inverse Multiple realizations

Regularization z-x preconditioning z x z-p h preconditioning z phph Prucha (2003)

Regularized inversion Prucha (2003) Least-squares inverse Migration

Multiple realizations Normalized migration Matching filters Least-squares inverse Multiple realizations

Multiple realizations: interpolation Clapp (2002)

Multiple realizations: velocity Clapp (2002)

Reports (all online) Seplib Computers: 4 clusters 3D real data