Gravity/Magnetic Interpretation

The Grav/Mag Interpretation extension automatically locates and determines depth for gridded magnetic and gravity data with Euler 3D Deconvolution processing routines. Euler 3D automates 3D geologic interpretation by delineating magnetic and gravimetric boundaries and calculating source depths.

The extension also includes the Keating Magnetic Correlation Coefficients function used in Kimberlite Exploration. This tool uses a simple pattern recognition technique to locate magnetic anomalies that resemble the response of a vertical cylinder model typical of Kimberlite pipes.

A Source Edge Detection (SED) tool is included for locating edges (e.g. geological contacts) or peaks from potential field data by analyzing the local gradients.

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

Working in Oasis montaj requires a Project (*.gpf) . A project encompasses every item in your workspace, from the data files in your project (e.g., databases, grids, maps, voxels, geosurfaces, 3D views, etc.) to the tools used (histograms, scatter plots, etc.) and the project setup including the menus you have displayed.

To start working with the Grav/Mag Interpretation extension, we recommend that you open a new project and then load the Grav/Mag Interpretation related menus.

Open a new project:

1. On the Project menu select New. The New Project dialog opens.

   You can also select the Create new project option on the startup dialog, which is displayed when you launch Oasis montaj.

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

3. The new project is opened, which enables the main menus, the icons on the main toolbars, and the Project Explorer. These visual clues indicate that you are ready to start working with the system.

Load the menu(s):

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

2. Expand the Extensions node, select the Grav/Mag Interpretation entry and click OK. The Grav/Mag Interpretation related menus will appear on the main menu bar.
   The menu system has been structured to enable you to quickly access a variety of tools and to provide an easy-to-use workflow to lead you through the main processing and filtering functions you can perform with the extension.

Once you have loaded the menu(s), you will have access to the Gravity/Magnetic Interpretation Help by clicking on the Help button on any of the dialogs:

• The reference Help topic for the dialog of interest will appear.

• You can navigate to another topic of interest from the Help Topics tab.

• You can search for a specific topic by typing in keywords in the Search tab.