3D Modelling of Gravity and Magnetics

GM-SYS 3D Modelling is gravity and magnetic modelling software for surface-oriented models 
which provides the ability to model complicated 3D subsurface structures of any size or scale. 

Powerful Three Dimensional Insight of Subsurface Structures

With GM-SYS 3D, you can:

  • Create insightful 3D models by integrating gravity and magnetic, and seismic data. 
  • Plot 3D displays of the model in one simple step, while retaining control over each element in the 3D visualization.
  • Automatically update 3D visualizations during inversion and structure editing.
  • Add wells, seismic sections or volumes, or other vector or raster information to 3D model visualizations.
  • Create a well-constrained model with the inversion tools.
  • Access the VALEM high performance computing (HPC) inversion service for recovering the base of salt in complex salt geometries.  

View VideoRead Feature Sheet

Features and Options

Review GM-SYS 3D Modelling capabilities

Fully integrated with the Oasis montaj platform, GM-SYS 3D Modelling provides a wide range of gravity and magnetic mapping, modelling and interpretation capabilities. It requires Oasis montaj and the montaj MAGMAP filtering extension. 

VALEM is an on-demand 3D inversion service available as an add-on to GM-SYS 3D. VALEM harnesses the power of Geosoft’s advanced 3D inversion technology in a high performance computing (HPC) cloud. 

View the feature summary below to assess if GM-SYS 3D is the right modelling solution for your project needs.  

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+ GM-SYS 3D Modelling Features

* Requires Oasis montaj and montaj MAGMAP
3D Block Properties click to enlarge
Create discrete property layers within a block as a function of depth.
Viewing Model click to enlarge
Display models as individual 2D horizon maps, arbitrary 2D profiles, and 3D visualizations.
Integrate Gravity and Magnetics click to enlarge
Calculate the gravity and magnetic response grid for your model.
Integrate Seismic click to enlarge
Import, contrain and visualize seismic data into your model for greater insight.
On-the-fly Projections click to enlarge
Advanced projection engine allows for on-the-fly projections that can handle over 2000 datums and projections.
Editing Grids
Interactive grid editing tools, and a toolbar for quick access to common functions.
Model Manipulation click to enlarge
Edit models to exactly your specifications, using inversion and other tools.
3D Inversion click to enlarge
Flexible and precise tools giving complete control over the inversion process.
Time-to-depth Conversions click to enlarge
Load time sections, build models in time and convert to depth for gravity and magnetic calculations.
Compatibility click to enlarge
Export a GM-SYS 3D model to common format including Geosoft voxels, UBC, and Gocad.
Unlimited Size and Quantity
Create realistic model structures with no limit to the number of layers or size of models.
Oasis montaj Integration
Access to plotting, projection, grid manipulation, filtering routines and complete Esri GIS data integration.
Forward Gravity Calculation for Draped Surveys
A new gravity calculation method provides more accurate results. This enables you to work on draped surveys without upward continuation and take advantage of the full resolving power of your surveys.
Support for Closed 3D Surfaces in GM-SYS 3D Models
​Using closed 3D surfaces, you may represent arbitrarily-shaped bodies of any complexity in the models. ​​Accurately represent geologic units that aren't easily represented by subhorizontal grids, such as convoluted and discontinuous allochthonous salt, dikes & plutons, or cave systems.​

+ VALEM Inversion Service

* Requires GM-SYS 3D
Resolves Base of Salt
Improved, interactive solution for base of salt and sub-salt interpretation that resolves the base of salt from gravity data bound by the constraints of seismic modelling. Structural inversion optimizes the salt geometry to improve the fit to gravity data and improves imaging of base of salt/sub-salt environments.
Integrated with GM-SYS
Tight integration with the GM-SYS 3D workflow allows for the creation, and importing, of geological models and grid surfaces for constraining model results. VALEM results can be assimilated back into GM-SYS 3D models.  
Streamlined Inversion Workflow
Streamlined gravity inversion workflow saves significant time compared to traditional methods.
Hybrid Calculation Techniques
VALEM uses hybrid calculation techniques to do joint inversion on layers and voxels for more accurate representation of salt geometry and sub-salt density distributions.
High Performance Cloud Computing Service
Utilizes Geosoft’s advanced 3D inversion technology deployed in a high performance computing (HPC) cloud to speed up space-domain calculations.

Operating System

Windows 8.1 (32-bit and 64-bit)
Windows 8 (32-bit and 64-bit)
Windows 7 SP1 (32-bit and 64-bit) - Recommended, minimum requirement.

CPU A Dual Core processor is recommended. An Intel Celeron processor is not recommended.
RAM 4-8 GB recommended, 1 GB minimum required.
Graphics Nvidia Professional 256MB 3D (OpenGL 2.0) Graphics Card recommended.
Printer/Plotters Any Windows® supported colour printer. Hewlett Packard® large-format ink-jet plotters are recommended.
Installation Permissions When installing Oasis montaj or Target, you MUST be logged on with Administrator permissions.
Installation Disk Space 2 GB or more of free space on the Program Files drive is required for the installation process.
Data Disk Space Data disk space depends on the volume of project data to be processed and the printer driver you are using. We recommend 500 GB to 1 TB, minimum 50 GB.

Internet Connection: To use VALEM, we recommend a medium to high-speed internet connection (512Kbps upload and 1Mbps download or higher). The faster your internet connection, the faster you will be able to upload your modelling information to the VALEM cloud servers and download your results.

Internet Browser: To use the internet capabilities in Oasis montaj or Target, you will need to install Internet Explorer 8.0 or later. This does not mean that you have to have Internet Explorer as your default browser; Oasis montaj and Target just use the internet connection technology supplied in IE8.

Supporting Software

The following software prerequisites are required and will be downloaded and installed if not present:
• Microsoft .NET 4.5.2
• ESRI ArcEngine 10.3

For information on requirements for previous versions and operating systems, see the system requirements page

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