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SKUA-GOCAD Velocity Modeling

Solutions for seismic imaging

Emerson E&P Software offers two complementary solutions for velocity modeling for seismic imaging purposes – SKUA-GOCAD™ and GeoDepth™.

For many years, SKUA-GOCAD has been used to create velocity models in many types of plays, including sub-salt (using unique salt modeling capabilities). Where there is a need for a sealed model that includes salt bags, faults and horizons, or where the velocity volume needs to follow stratigraphic layers, the advanced technologies in SKUA-GOCAD can significantly impact the resulting seismic images.

Through tight integration with the industry-leading GeoDepth velocity determination solution, velocity volumes, geological formation volumes, and dip/azimuth volumes created in SKUA-GOCAD can be used for illumination, grid tomography and migrations, and RTM modeling workflows. Subsets of the complex SKUA-GOCAD model can be sent to GeoDepth for model-based tomography.  Interpretation data can be seamlessly shared between SKUA-GOCAD and GeoDepth through the Epos™ infrastructure.


The wide range of powerful yet easy-to-use velocity modeling methods offered by SKUA-GOCAD enables accurate, efficient, and productive time-to-depth conversion, including advanced tools and a user-friendly depth conversion process. Unlike other solutions where structural complexity is quickly a limiting factor and where the approach incorporates simple layering, SKUA structural and stratigraphic modeling enable accurate time-to-depth conversion in salt and structurally complex environments, using 3D operations that honor the stratigraphy and faults.

With SKUA-GOCAD velocity modeling technology, you can:

  • Construct salt bags or salt sheets from picks, and insert salt inside a sediment velocity background
  • Construct layer-based velocity models interpolating interval velocities in SKUA paleo-space
  • Integrate complex structures such as salt, reverse faults and overthrust
  • Manipulate and rework any velocity model to make time-to-depth conversion fit the horizons of the matching well markers
  • Integrate complex structures such as salt, reverse faults and overthrust
  • When connected to GeoDepth via Epos, use SKUA to rapidly create the solid models required for ray tracing

SKUA-GOCAD is fully integrated with Emerson E&P Software seismic imaging applications, and builds the velocity model in conjunction with them. It analytically removes noise from seismic velocities, enabling the user to identify and exploit trends during calibration. Calibration and correction of seismic-derived velocity volumes to well markers assure better depth-to-time conversion.

Other features:

  • Sealed model technique, which allows different velocity functions in each compartment. This results in easy identification of automatic fault blocks and layers, and a more accurate representation.
  • Use of workflows to automatically update the model with new data.
  • Full suite of algorithms, from simple linear interpolation to moving average to advanced geostatistics. These may all be used as hard or soft data: Check shot, sonic, stacking velocity, markers, etc.
  • 3D viewer that allows the simultaneous display of all time and depth domain objects loaded into the same project. Users can easily create several velocity models in the same study and see the impact of uncertainties on depth conversion.

System Requirements

Interoperability Options

All Epos-based applications enable interoperability with third-party data stores, including:

  • RESQML 2.0.1
  • OpenWorks® R5000.10
  • Petrel* 2017 & 2016
  • Recall™ 5.4.2

(*is a mark of Schlumberger )