TomoML is a new, ray-based, multi-layer approach to reflection tomography. It replaces layer-stripping tomography with an efficient new workflow which performs a simultaneous update of the entire model in a single pass. Major velocity contrasts are intelligently repositioned, thus avoiding issues of incorrect horizon positions seen with conventional global tomography.

A custom hybrid velocity model format has been developed for TomoML. It defines the velocity and anisotropy parameters for each layer as a mesh. Layer boundaries are accurately represented by bounding horizons. Tomography parameters can be individually tailored for each layer to make the most of available Residual Move Out (RMO) information and well data.


  • Improved seismic images with less reflector distortion
  • Improved model accuracy with fewer non-geologic anomalies
  • Inter-layer communication - all layers contribute to the inversion, improving stability

Work Flow

  • No restrictions during model building, update any layer at any point
  • PSDM test lines always fully imaged to target level
  • Tornado Facet QC aids the choice of best tomography results


  • Potentially fewer iterations required for a typical PSDM project
  • Potentially less client re-interpretation effort

Recent Advances in Ray-based Tomography

Gilles Lambaré | Patrice Guillaume | Jean-Philippe Montel
©2014 EAGE

Multi-layer non-linear slope tomography

Patrice Guillaume | Xiaoming Zhang | Anthony Prescott | Gill...
©2013 EAGE

The application of multi-layer tomography for...

Steve Hollingworth | Owen Pape | Richard Jupp | Patrice Guil...


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Full Waveform Inversion

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