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

Extracting seismic uncertainties from tomogra...

Jeremie Messud | Mathieu Reinier | Herve Prigent | Patrice G...
©2017 SEG

The application of multi-layer tomography for...

Steve Hollingworth | Owen Pape | Richard Jupp | Patrice Guil...
Multi-Client Data - Cornerstone


35,000km2 Cornerstone contiguous broadband PSDM data with added-value Facies Finder and PPP products to help pinpoint the best prospects

Subsurface Imaging - FWI

Full Waveform Inversion

Reveal intricate velocity details for the clearest images. Harness seismic low frequencies from BroadSeis, StagSeis, seabed and land data.

Subsurface Imaging - Least-Squares Migration

Least-Squares Migration

Least-Squares Migration provides images with better balanced illumination, improved signal-to-noise ratio, reduced migration artifacts and more interpretable seismic amplitudes.

EAGE YouTube - Tomography

EAGE YouTube Channel

Recent Advances in Ray Based Tomography.
by Gilles Lambaré
© 2014 EAGE Education B.V.
Subsurface Imaging


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