Magnetotelluric surveys are 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.
Magnetotelluric 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.
Data gathered in magnetotelluric surveys can deliver both structural information and fluid flow pathways. It is a useful tool for the investigation of hydrocarbon, geothermal, mining, and groundwater. Magnetotellurics can also be used in earthquake precursor research by contributing to the understanding of crustal and mantle processes.
Recent projects in Colombia demonstrate accurately imaging the target body. The unique approach deployed by Metatek started by flying a Full Tensor Gradiometry survey (iFTG). This enabled the correct placement of the magnetotelluric and subsequent detection of the target body. Challenging terrain and a suitable geological setting combined with a restricted budget made magnetotelluric survey an obvious choice.
Magnetotellurics can be used to verify structures and de-risk acreage prior to embarking on expensive 2D/3D seismic programs at a fraction of the cost of seismic acquisition.
There are several key advantages of megnetotelluric surveys, which include:
The electrical data acquired using magnetotellurics is supplementary to seismic data and becomes particularly valuable when integrated with seismic data and other geophysical observations.
Also, non-unique technologies, such as FTG and magnetics, can now be constrained accurately using the direct measurement magnetotellurics dataset.
At Metatek, we can provide magnetotelluric surveys for various applications worldwide. Our services also include data processing so you get the most out of the information gathered. Contact us for more information.
