Procedure of electromagnetic sounding interpretation for geoelectric conditions of Siberian craton south (electric facies analysis)

The article considers advanced approaches to interpreting electromagnetic data i.e. near-field transient electromagnetic sounding (TEM) that provide prompt information on the area under study. The electric facies analysis is an innovative technique of electromagnetic survey in which at the stage of the qualitative analysis of the electromagnetic survey data, the initial curves are integrated into the GeoDepth Paradigm seismic processing package by means of specialized software. As a result of the study, electric facies for the main geoelectric complexes have been mapped in the Stratimagic environment. The maps are based on the stratigraphic marks obtained by the seismic survey. The comparison of the electric facies maps and longitudinal conductivity maps shows the anomalous field match which confirms the method correctness. The electric facies classes are thereafter compared with the test data on the deep-hole wells located in the studied area. The electric facies analysis significantly increases the level and enhanced the informational content of the qualitative analysis of the TEM data. The integration of the electromagnetic data in seismic software packages facilitates integration at all stages of the geophysical data interpretation, thus increasing the validity of the complex predictive parameter and the reliability of mapping for the promising oil-and-gas sites.

electromagnetic survey, near-field electromagnetic sounding in the near zone, TEM curve transformation, electric facies, Siberian craton, promising oil-and-gas areas, conductive oil-reservoir horizon

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