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Publisher Summary This chapter discusses the regional magnetotelluric (MT) explorations in Russia. Electromagnetic (EM) geophysical methods (telluric current method, magnetotelluric sounding, frequency sounding, and transient sounding) have been used in the erstwhile Russia to study a deep structure of sedimentary basins and of the consolidated crust since the 1950s. Tectonic schemes of the principal sedimentary basins of Russia were constructed and several large hydrocarbon deposits, for example—the Urengoy gas field, were discovered using the telluric currents method and MT soundings, in combination with other geophysical methods. The basic regional EM method is the MT method. MT provides the largest exploration depth and is inexpensive and mobile, as it does not require an artificial field source MT investigations essentially expand the existing ideas about the structure and geodynamics of the Earth's interior, based on the results of drilling and of seismic, gravity, and magnetic studies. MT investigations provide unique information about the structure and reservoir properties of sedimentary complexes, the state of active geodynamic regions, the graphitization and fluid regime of the consolidated crust, and the permeable and fluid-saturated crustal zones. |
