All-Russian network of reference geophysical profilesRegional-scale magnetotelluric studies in Russia are being conducted as a part of governmental projects initiated by the Russian Ministry of Natural Resources. Nord-West Ltd. is taking active part in these surveys and since 2010 has already acquired more than 50 000 MT sites. An example of resistivity image and geological interpretation of a small part of the 3-SB profile (Siberian platform, in the interfluve between Podkamennaya Tunguska and Nizhnyaya Tunguska rivers) is given below.
The main goal of this survey was to construct a resistivity model of the sedimentary cover by the means of joint interpretation of MT, seismic (
CMP), well logging and potential fields’ data. The model was then analyzed to identify the electrical conductivity anomalies associated with good reservoir rock properties in the Lower Paleozoic, Vendian (Neo-proterozoic) and Riphean (Mezo-proterozoic) formations.