MT AMT Key Advantages and Benefits
The magnetotelluric surveys reach great depths in confined spaces.
They are used in general to define the geological and hydrogeological setting for the following applications:
- Definition of structures of deep gravitational instability (deep landslide);
- Definition of geological and tectonic structures for tunneling design;
- Definition of geothermal and hydro‐geological models for the optimal location of wells;
- Great depth of penetration (10’s of kms);
- Provides information in non-seismic or poor seismic areas;
- No transmitter required;
- Light-weight equipment — very portable (good for reconnaissance);
- Good production rate (2 – 5 km/day);
- Better resolution than grav/mag;
- Well-developed interpretation procedure;
- Fast interpretation;
- Little impact on environment;
- Can access almost anywhere;
Acquisition systems are based on lightweight 24-bit 5-channel GPS-synchronized recording units covering the frequency range from 0 to 50 kHz.
The data acquisition system has a receiver unit (Unit MT), two electromagnetic sensors, and four electrodes the placement of 4 electrodes arranged in a cross the disposition of the two orthogonal magnetic sensors at a distance of about 25 m from the instrument receiver.
Magnetotellurics MT / AMT – Oil and Gas Exploration
To Magnetotellurics MT / AMT, the conditions which cause difficult seismic energy propagation are largely irrelevant and so the method readily images the resistivity of the sub-surface.
MT Geothermal Exploration
The contrast of resistivity provides an excellent tool for identifying geothermal targets.