We offer worldwide land passive magnetotelluric (AMT MT) methods.
Under some geological conditions, it is impossible or prohibitively expensive to acquire useful seismic data. These conditions include subthrust plays, areas of volcanic cover, and beneath shallow salt bodies.
To MT AMT, the conditions which cause problems to seismic data are largely transparent, and thus the method readily images the subsurface in terms of resistivity.
Ideal targets include resistive carbonate reservoirs below shale or flysch, clastic reservoirs below salt bodies.
Magnetotellurics is a broad-band electromagnetic geophysical technique which uses natural time-dependant variations in the Earth’s magnetic field as the source, and electric fields induced in the earth as output using a series of simultaneous measurements of the fluctuations of the local electric and magnetic field.
These data are used to determine (usually via 2D or 3D inversion) the resistivity distribution within the earth to depths of many kilometers. This is then interpreted in terms of lithology.
The interpolation between adjacent data allows the definition of a section of electrical resistivity (exactly as in the case of a geoelectric resistivity section).
Natural-source Audio-frequency Magnetotellurics (AMT and MT) is an electromagnetic survey technique that uses naturally-occurring ionospheric currents (passive energy sources) to electrically map geologic structure to depths of 1000-2000 meters or more.
Discover how PGES provides the MT technology that improves efficiency and enable unprecedented levels of integration across the full spectrum of E&P technology. A combined measurements of electric and magnetic field is under going in the US KY.
The contrast of resistivity provides an excellent tool for identifying geothermal targets.
To passive magnetotellurics MT and AMT, the conditions which cause difficult seismic energy propagation are largely irrelevant and so the method readily images the resistivity of the sub-surface.
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.
The magnetotelluric surveys reach great depths in confined spaces.