Gravity/Magnetic Interpretation

The Grav/Mag Interpretation extension automatically identifies and estimates the depth of sources in gridded magnetic and gravity data using Euler 3D Deconvolution processing routines. Euler 3D streamlines 3D geologic interpretation by delineating magnetic and gravimetric boundaries and calculating source depths.

The extension also includes the Keating Magnetic Correlation Coefficients function, commonly used in Kimberlite exploration. The tool applies a simple pattern recognition technique to detect magnetic anomalies that resemble the response of a vertical cylinder model—typical of Kimberlite pipes.

The Source Edge Detection (SED) tools are provided for identifying edges (e.g., geological contacts) or peaks in potential field data by analyzing local gradients.

The Source Parameter Imaging (SPI) tools automatically calculate the depth of magnetic sources from a gridded magnetic dataset. The resulting depths are displayed as a grid and are based on source parameters from the following models: contacts (faults), thin sheets (dikes), and horizontal cylinders.

Working in Oasis montaj requires a project file (*.gpf). A project encompasses all items in your workspace, including:

  • Data files such as databases, grids, maps, voxels, geosurfaces, and 3D views

  • Visualization tools like histograms and scatter plots

  • Project settings, including the menus currently displayed

This structure ensures that your entire working environment is saved and easily restored.

To begin working with the Grav/Mag Interpretation extension, we recommend opening a new project and then loading the menus related to the extension.

Open a New Project

  1. On the Project menu select New. The New Project dialog will open.

    You can also select Create new project from the startup dialog that appears when you launch Oasis montaj.

  2. In the New Project dialog, specify the name and location for your new project file (*.gpf), then click Save.

  3. The new project will open, enabling the main menus, toolbar icons, and the Project Explorer. These visual indicators confirm that the system is ready for use.

Load the Menus

  1. On the Project menu, select Manage Menus, or click the Manage Menus icon on the Project Explorer toolbar. The Manage Menus dialog will appear.

  2. Expand the Extensions node, select Grav/Mag Interpretation, and click OK. The menus related to the extension will now appear on the main menu bar.

The menu system is designed to provide quick access to a variety of tools and to guide you through the primary processing and filtering workflows in the extension.

To automatically load these menus in future projects, specify them in the Default menus field of the General Settings dialog.

Accessing Help

Once the Gravity/Magnetic Interpretation menus are loaded, click the Help button in any dialog opened from these menu items:

  • The reference topic for the current dialog will be displayed.

  • Use the Help Topics tab to navigate to others topics of interest.

  • Use the Search tab to find specific topics by entering keywords.

The Grav/Mag Interpretation menu system is divided into four main menus:

  • Euler 3D

  • Kimberlite

  • Source Edge Detect

  • Source Parameter Imaging