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Metatek’s Magnetotellurics (MT) datasets offer section imaging of the subsurface resistivity/conductivity as stand-alone or, more usefully, to complement the spatial datasets acquired on an airborne campaign.

Understanding Magnetotellurics

Magnetotellurics is a geophysical exploration method using the Earth’s magnetic and electrical fields to measure the electrical resistivity of the sub-surface. 

When using the magnetotellurics method to measure a given area, the rock composition can be determined based on the electrical resistivity.

Magnetotellurics surveys provide valuable information about subsurface structures without the need for invasive drilling, making it an important tool in the field of geophysics for understanding the Earth’s structure and processes.

Uses of Magnetotellurics

MT data can deliver both structural information and fluid flow pathways. It is a useful tool for the investigation of hydrocarbon, geothermal, mining, and groundwater.

Recent projects in Colombia demonstrate MT accurately imaging the target body. The unique approach deployed by Metatek started by flying a Full Tensor Gradiometry survey. This enabled the correct placement of the MT and subsequent detection of the target body. Challenging terrain and a suitable geological setting combined with a restricted budget made MT an obvious choice. Magnetotellurics can be used to verify structures and de-risk acreage prior to embarking on expensive 2D/3D seismic programmes at a fraction of the cost of seismic acquisition. 

Magnetotellurics Key Advantages

There are several key advantages of MT, which are

  • No protracted permitting application is required
  • Quick and easy to deploy (ideal for challenging terrain and conservation areas)
  • Able to image seismically opaque sub-surface (sub-salt, basalt, carbonates, volcanics)
  • Extremely cost-effective, saving up to 80% of equivalent seismic acquisition
  • Passive technique with no explosives or vibrating pads
  • Ideal for foothills, mountainous terrain and valley floors
  • Image up to tens of km below the Earth’s surface

The electrical data acquired using magnetotellurics is supplementary to seismic data and becomes particularly valuable when integrated with seismic data and other geophysical observations. 

Non-unique technologies, such as FTG and magnetics, can now be constrained accurately using the direct measurement MT dataset.

Gravity, FTG or eFTG integrated with magnetotellurics will provide highly accurate and usable earth models to refine further exploration activities.

Magnetotellurics From Metatek 

At Metatek, we have extensive knowledge and experience when it comes to magnetotellurics. If you have a project and are looking for a partner, then contact our team today. 

Get In Touch

Call us on +44 1908 667014, or use the form below and we’ll get in touch as soon as possible.