GM-SYS 3D Modelling with Velocity Volumes

GM-SYS 3D Modelling with Velocity Volumes

Geosoft demonstrated the latest features in our GM-SYS 3D gravity modelling software at this year's EAGE in Copenhagen. Topping the list of what's new is 3D hybrid density model support.

With the latest version, GM-SYS 3D Modelling v7.5, you can create 3D gravity models that incorporate a velocity volume from a 3D seismic survey. Previously you were limited models with horizons extracted from density cube and constant density layers like this one:



GM-SYS 3D Modelling




When integrating with seismic reflection surveys, models are defined as velocity or density cubes. The filled density voxel shown above was created from a velocity model in SEG-Y format. Seismic interpreters commonly provide velocity models to potential-field professionals as an exchange format. Velocity information must then be converted to density using known relationships between parameters. The Velocity to Density conversion utility was introduced in v7.2 and enables easy conversion between density and velocity allowing selection from ten of the most commonly-used, published relationships.



GM-SYS 3D Modelling




In GM-SYS 3D Modelling v7.5 we can build models using 3D density distributions, like this one with a 3D density distribution below the bathymetry (bathymetry is shown by the pink surface near the top of the model). This new density distribution can be used for forward modelling of gravity and gravity gradiometry data with a more accurate representation of the density distribution in a 3D model.

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