The regularities of the amplitudes and phases connections of magnitotelluric (MT) impedance tensor components for 1D, 2D and 3D geoelectrical synthetic models have been considered. The amplitude-phase correction allows to improve the quality of data processing results both for the main and for the additional impedances. It also gives a possibility to suppress biased data for noise pollution data. Recommendations on accuracy rising of determination of tensor impedance components in the MT-data processing have been defined on the base of found regularities. Examples of processing of field MT-data received on the basis of MTU equipment by «Phoenix Geophysics Ltd» (Canada) have been considered.
The electromagnetic (MTS) investigations with the use of Canadian MTU equipment have been carried out along CDP profiles, crossing Central Regions of Russia. The results are presented in the form of seismic-geological sections. Their total extend is 1430 km. The analysis of electric logging of 19 boreholes, disposed in the vicinity of the profiles, has been executed. The composite geological section extending from north boundary of Moscow syneclise to south boundary of Ryazan-Saratov trough has been compiled. Principal electrical conduction horizons of sedimentary cover are associated with Carboniferous – Permian terrigenous complexes. Along sizable intervals of the profiles conduction complexes of Meso-Neoproterozoic age are separated below these complexes. Structural features of sedimentary-metamorphic Paleo-Mesoproterozoic rocks are observed in the consolidated basement. The characteristic features of the geoelectric model of the area of investigations are described. The problems and prospects of electrical methods application in complex of hydrocarbon prospecting investigations are discussed.
The database of digitized regional electrical materials is described. The database covers territories of Ease-European platform and adjusting fold areas (Kuakas, east flank of Uralian fold area, Skiff plate and Timan-Pechora region of Barents fold area). Besides of primary information, the database includes resulting geoelectric maps and sections. The results of their experimental geological interpretation show, that geoelectric data provide: modeling of sedimentary cover which is adequate to seismic data; modeling of blocks and interblock (suture) zones boundaries, which is more reliable that seismic data interpretation; separation of ancient volcanogenic-sedimentary layer in the upper part of the consolidated crust.
