Seismic Modeling, Migration and Velocity Inversion Tomography Bee Bednar Panorama Technologies, Inc. 14811 St Marys Lane, Suite 150 Houston TX 77079 May 18, 2014 Bee Bednar (Panorama Technologies) Seismic Modeling, Migration and Velocity Inversion May 18, 2014 1 / 19
Outline Tomography 1 Residual Tomography Bee Bednar (Panorama Technologies) Seismic Modeling, Migration and Velocity Inversion May 18, 2014 2 / 19
Tomography Outline Tomography 1 Residual Tomography Bee Bednar (Panorama Technologies) Seismic Modeling, Migration and Velocity Inversion May 18, 2014 3 / 19
Tomography Residual Tomography Tomography after Migration Residual tomography Generally applied after iterative shot-spread analysis has run its course Based on Local ”best” image dip Offset differences from gathers Bee Bednar (Panorama Technologies) Seismic Modeling, Migration and Velocity Inversion May 18, 2014 4 / 19
Tomography Residual Tomography Residual Tomography Tomographic geometry. Bee Bednar (Panorama Technologies) Seismic Modeling, Migration and Velocity Inversion May 18, 2014 5 / 19
Tomography Residual Tomography Residual Tomography Tomographic geometry. Bee Bednar (Panorama Technologies) Seismic Modeling, Migration and Velocity Inversion May 18, 2014 6 / 19
Tomography Residual Tomography Tomographic Input Requirements Residual depths as input to tomography. Bee Bednar (Panorama Technologies) Seismic Modeling, Migration and Velocity Inversion May 18, 2014 7 / 19
Tomography Residual Tomography Constraining Tomography Natural Tomographic Constraints Bee Bednar (Panorama Technologies) Seismic Modeling, Migration and Velocity Inversion May 18, 2014 8 / 19
Tomography Residual Tomography Residual Tomography Tomographic back projection. Bee Bednar (Panorama Technologies) Seismic Modeling, Migration and Velocity Inversion May 18, 2014 9 / 19
Tomography Residual Tomography Non-Flat Gathers Before Non flat gathers. Bee Bednar (Panorama Technologies) Seismic Modeling, Migration and Velocity Inversion May 18, 2014 10 / 19
Tomography Residual Tomography Flat Gathers After Flat gathers. Bee Bednar (Panorama Technologies) Seismic Modeling, Migration and Velocity Inversion May 18, 2014 11 / 19
Tomography Residual Tomography Tomographic Updating Horizon Based Tomography Bee Bednar (Panorama Technologies) Seismic Modeling, Migration and Velocity Inversion May 18, 2014 12 / 19
Tomography Residual Tomography Tomographic Example from Alaska Alaska land data image without tomography Bee Bednar (Panorama Technologies) Seismic Modeling, Migration and Velocity Inversion May 18, 2014 13 / 19
Tomography Residual Tomography Tomographic Example from Alaska Alaska land data image with tomography Bee Bednar (Panorama Technologies) Seismic Modeling, Migration and Velocity Inversion May 18, 2014 14 / 19
Tomography Residual Tomography Tomographic Example from Wyoming Wyoming land data image without tomography Bee Bednar (Panorama Technologies) Seismic Modeling, Migration and Velocity Inversion May 18, 2014 15 / 19
Tomography Residual Tomography Tomographic Example from Wyoming Wyoming land data image with tomography Bee Bednar (Panorama Technologies) Seismic Modeling, Migration and Velocity Inversion May 18, 2014 16 / 19
Tomography Residual Tomography Tomographic Example from the Gulf of Mexico Gulf of Mexico tomographic example. After Marta Jo Woodward. Courtesy WesternGeco Bee Bednar (Panorama Technologies) Seismic Modeling, Migration and Velocity Inversion May 18, 2014 17 / 19
Tomography Residual Tomography Tomographic Input Requirements Required input to residual tomography A good migration velocity field A current set of horizons or Local dip everywhere As many horizons as possible. Picked set of residual depths for each common offset or angle gather Bee Bednar (Panorama Technologies) Seismic Modeling, Migration and Velocity Inversion May 18, 2014 18 / 19
Tomography Residual Tomography Questions? Bee Bednar (Panorama Technologies) Seismic Modeling, Migration and Velocity Inversion May 18, 2014 19 / 19
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