EMIGMA Premium and Professional Series

EMIGMA for FEM

The FEM package supports Ground and Borehole (Premium) or Near-Surface (Professional) FEM and is available as a standalone product or as an add-on to other Premium or Professional series licenses.

Ground FEM allows for various survey configurations. Coil pairs can be horizontal coplanar (EM31/34/38,Gem2, AEM, Max-Min), vertical coplanar (EM31/34/38,Gem2), horizontal co-axial (AEM), broadside co-axial (fixed-wing AEM, EM38), null-coupled (DualEM), vertical co-axial plus virtually any configuration that you may desire. The transmitter and receiver can be housed in the same case or separated by 10s to 100s of meters. Depending on the system, single or multiple frequencies are sampled. Borehole FEM includes both fixed and moving configurations. The transmitter is either a large loop set on the surface ground with the receiver moved in the borehole or a dipole moved along with a 3-component receiver in the same borehole at a constant separation. The cross-hole configuration is also available.

Borehole configurations are available only in the Premium Version

Unlimited Survey Size with Premium! 50,000 data points per survey with Professional!

Data Import

• Data imports from ASCII files or manufacturers format

Data Processing and Correction

• 1D digital and spatial filters, 2D spatial filters
• Data interpolation
• Simple and weighted averaging decimation
• Data Corrector tool combining dynamic spreadsheets and line plotter for data cleaning, missing data interpolation and simultaneous plotting of different data channels for fast cross-analysis
• ProfileModifier for analyzing and cleaning up your survey points and quick data overlays

Data Display and Analyses

• Grids: Natural Neighbor, Delauney Triangulation, Shepard, Minimum Curvature and Thin-Plate-Splines
• Display of Apparent Resistivity as a surface or spatial contour
• Display of 3D inversion models sliced and diced in the 3D Visualizer
• PEXShow tool - 2D representation of geoelectric sections
• Contours: 2D and 3D surfaces
• Line plots
• Easy comparison of inversion to data or model to data
• Residual plots
• Model removal from data for enhanced anomaly imaging

For more detailed data display capabilities, see EMIGMA Complete

3D Modeling

• Fast and accurate 3D simulations: model suite generation and batch mode
• Unlimited prism, plate and polyhedra targets
  Polyhedra: pipes (hollow cylinders with or without lids), ellipsoids, shells, bullets, landmines, drums, spheres, general polyhedra...
• Multiple body interactions
• Modeling of topography effects
• Modeling of magnetic effects in EM data
• Ability to handle full contrast between host and bodies
• Interactive 3D visual model building tool

1D Inversion

• Joint Susceptibility/Apparent Resistivity Inversion - 3D Resistivity volumes including susceptibility effects
• Smooth Occam and non-smooth Marquardt algorithms - Two-layer inversion for mapping overburden or depth to basement and Multi-layer inversion for up to 19 layers of non-uniform thickness
• Suite of minimization techniques
• Incorporation of GPS_Z information

EIKMAP

• Only in Premium!
• Apparent Resistivity Tool - a half-space mapping technique for generating apparent resistivities as a function of frequency
• Sengpiel Depth-Sections - a resistivity pseudosection technique for generating resistivities as a function of pseudo-depths

Exports

• Export of images to postscript files or raster formats
• Export of modeled, inverted, processed data or grids to XYZ ASCII files
• Geosoft exports
• GeoTutor exports
• Scalable or unscalable hardcopies