GM-SYS 3D Modeling

The GM-SYS 3D Modeling extension to Oasis montaj enables you to design three dimensional models capable of accurately depicting the variation and irregularity of subsurface structures.

The software's user-friendly interface provides easy model creation, visualization and manipulation. An included inversion module and the ability to import constraints from other sources, makes it easier to create a well-constrained model.

GM-SYS 3D models consist of Oasis montaj topography grids stacked, one on top of the other, with space between each grid. Each grid represents a surface between blocks. A block is defined as the space between any two grids. Blocks may extend to infinity or terminate where two grids make contact. As in the real world, any block may have internal variance in density and susceptibility. There is no limit to the size or number of grids, thus models of any size can be created.

Among its many new features, GM-SYS 3D Version 1.3 responds to users' requirements for efficiency with capabilities to:

• Write a GMSYS 3D model to a Geosoft voxel
• Calculate gravity response from Geosoft density voxel
• Load cross section grids of density and susceptibility values directly into 3D views. Users can write GM-SYS 3D models to Geosoft voxels, UBC or GOCAD.
• Quickly create time-to-depth conversions. It has a "seismic" tab for time models and a "velocity" tab for layer parameters.
• Use 3D Model Explorer to display information about the current model in a modeless dialogue
• Complete backup scheme for inversion target grids

Use GM-SYS 3D to:

Calculate the gravity and magnetic response grid for the model you create.

These response grids are compared to the observed measurement grids. Discrepancies can be visually noted or calculated by subtracting one grid from another. The model is then edited until the response grids match the measured grids.

Edit models to exactly your specifications, using inversion and other tools.

Editing features enable users to create any number of extremely irregular blocks of almost any conceivable shape.

Write a GYMSYS-3D model to Geosoft voxels, UBC or GOCAD.

Supplement the seismic information derived from Geosoft density voxels into calculations of the voxels' gravity responses.

Quickly create time-to-depth conversions.

Build a "Time" model using seismically-derived time horizons and velocities, then convert this directly to a "Depth" model. A new "Seismic" tab in the model-editing dialog and "Velocity" tab in the layer-editing dialog allow a seamless integration of seismic data into the existing model structure.

View models at any angle and from any position both inside and outside the model.

Thoroughly examine any portion of the model, and intelligently direct the modeling process.

Speed the modeling process and help to constrain variables, using a variety of import and export features.

Profile models may be imported to create beginning models. Seismic bitmaps and other images, SMT seismic grids, horizons, depth picks and well log data can also be imported both to help create a model and constrain variables. Profiles can also be extracted and compared to profiles based on seismic data, cross sectional balancing models or other sources.

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