wavefield seismic imaging
TRANSCRIPT
Wavefield seismic imaging
Paul Sava
Center for Wave PhenomenaColorado School of Mines
Wide-azimuth imaging
Elastic wavefield imaging
Interferometric imaging
Stereographic imaging
Stream computing
Wide-azimuth imagingsynopsis
I Wide-azimuth acquisition
I Narrow-azimuth processing
I We need to develop methods forI illumination compensationI multiples suppressionI model building (velocity, anisotropy)
Wide-azimuth imagingCWP research
Migration by wavefield extrapolation
I Wide-azimuth wavefield extrapolation
I Extended (cross-correlation) imaging condition
I 3D angle decomposition
Wide-azimuth imaging
Elastic wavefield imaging
Interferometric imaging
Stereographic imaging
Stream computing
Elastic wavefield imagingsynopsis
I Multi-component (vector) acquisition
I Single-component (scalar) processing
I We need to develop methods forI anisotropic elastic imagingI amplitude reconstructionI model building (anisotropy)
Elastic wavefield imagingCWP research
Multi-component reverse-time migration
I Vector wavefield extrapolation
I Wavefield decomposition in pure wave modes
I Conventional/extended imaging condition
Wide-azimuth imaging
Elastic wavefield imaging
Interferometric imaging
Stereographic imaging
Stream computing
Interferometric imagingsynopsis
I Depth migration assumes exact velocity
I Velocity analysis produces approximate velocity
I We need to develop methods forI imaging heterogeneous and irregular saltI imaging complex stratigraphyI imaging basalt, carbonates, etc.
Interferometric imagingCWP research
Interferometric imaging condition
I Wavefield extrapolation in background model
I Image-space interferometric imaging
I Local averaging for statistical stability
Conventional imaging
Interferometric imaging
Interferometric imaging
Interferometric imaging
Interferometric imaging
Interferometric imaging
Wide-azimuth imaging
Elastic wavefield imaging
Interferometric imaging
Stereographic imaging
Stream computing
Stereographic imagingsynopsis
I Data interpretation exploits wavefield structure
I Imaging condition ignores wavefield structure
I We need to develop methods toI eliminate cross-talk due to multiple sourcesI eliminate cross-talk due to multi-pathingI eliminate cross-talk due to multiple reflectionsI eliminate cross-talk due to multiple wave-modes
Stereographic imagingCWP research
Stereographic imaging condition
I Wavefield decomposition prior to imagingI propagation timeI local slope
I Sparse wavefield representation
I Imaging condition in decomposition domain
Multiple sources
Multiple paths
Shot 1 Shot 2
Conventional I.C. Stereographic I.C.
Wide-azimuth imaging
Elastic wavefield imaging
Interferometric imaging
Stereographic imaging
Stream computing
Stream computingsynopsis
I Process seismic data on distributed systems
I Moore’s Law is dead! Long live Amdahl’s Law!
I We need to develop methods toI use new computer architectureI use new computing models (streams)
Stream computingCWP research
Stream processing of seismic data
I Multi-core processing
I Stream processing on GPUs
I Benchmark: finite-difference modeling