Near-Surface Modeling Toolkit

Velocity models for land depth imaging

The near-surface modeling toolkit (NSM) is a set of processes and workflow components designed to support the construction of land velocity models in Omega seismic data processing software and the Petrel E&P software platform.

With the NSM toolkit, near-surface and deeper velocity models can be built and merged to form an integrated model suitable for reflection tomography and depth migration workflows. The source of the shallow velocity information can currently be refraction analysis or refraction tomography. Deeper velocities are obtained from conventional velocity analysis methods.


  • Fully integrated with Omega software first-arrival refraction solution seismic function modules (SFMs), including Refraction MISER (delay-time refraction statics) and Refraction TOMO (Tau-p refraction tomography).
  • Import and export of geometry databases in Omega software
  • Population of layered velocity models to gridded Volcan models in Petrel software
  • Creation of a smooth datum close to the recording surface, suitable for depth migration
  • Surface-consistent static corrections to the above datum, appropriate for the migration model
  • Visualization of source and detector attributes at source and detector positions
  • Source and detector data as “point sets” in the Petrel software object tree


  • Making velocity and property models that include the near-surface for depth imaging, reflection, and refraction tomography
  • Quality control and visualization of refraction solutions and their attributes

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Spatially Relative Amplitude Compensation Can Smooth Sudden Changes in Amplitude

Successive steps in the construction of the final velocity model
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