MAGMATISM OF THE OMOLON CRATON TERRANE (NORTHEASTERN RUSSIA): GEOCHRONOLOGY, GEOCHEMISTRY, AND GEODYNAMICS
O.V. Nechaev, I.V. Mikhaylov, M.N. Nikitenko, V.N. Glinskikh
1Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia
Keywords: transient sounding, electromagnetic monitoring, cryolithozone, geoelectric model, numerical simulation, vector finite element method, Sumudu transform, induction coil, current line, cross-borehole exploration
Abstract
The article considers the results of mathematical modeling of transient electromagnetic cross-borehole monitoring data for civil and industrial cryolithozone facilities containing thaw zones (taliks) in their vicinity. A solution to the direct problem is presented based on the Sumudu integral transform and the vector finite element method for two types of borehole sources: induction coils and a less common electric current line, taking into account the frequency dispersion of the specific electrical conductivity of permafrost. Numerical three-dimensional modeling of the transient signals is performed in realistic geoelectric models of a gas-producing borehole and a residential building on piles. Based on the modeling results, we revealed the main features and differences of transient cross-borehole monitoring with coils and a line as the source.
|
