Construction of the crystalline basement surface model for the Lena-Tunguska petroleum province was performed based on the results of integrated interpretation of electrical survey data from near-field transient electromagnetic (TEM) soundings and magnetotelluric (MT) soundings, magnetic survey, and gravity survey. Each method is characterized by its own complicating physical-geological factors and ranges of ambiguity in the solutions of inverse problems. It is shown that integrated interpretation of gravitational and magnetic fields allows reducing the ambiguity caused by the lack of a priori information, the variety of structural constructions from previous years, and complex geoelectrical conditions at the regional stage. To delineate 3D heterogeneities based on density and magnetic properties, cascade inversion technology was used. Formation of a generalized model of volumetric distribution of density and magnetic properties was carried out based on structural-material complexes, identified as a result of classification by the classical machine learning method – K-means. The integrated approach increased the reliability of geological interpretation in zones of data complications for TEM and MT. The formed medium models allowed refining the understanding of the presumed structure of the basement surface.
Davydenko et al. (Wed,) studied this question.