All-Russian network of reference geophysical profiles
Regional-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.