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EFFECTIVENESS ANALYSIS OF ELECTROTOMOGRAPHY SOFTWARE SYSTEMS FOR FIELD DATA INTERPRETATION IN SEISMICALLY ACTIVE AREAS (USING THE EXAMPLE OF THE GORNY ALTAI)

I. O. Shaparenko, N. N. Nevedrova, A. V. Marinenko, I. V. Surodina

A. A. Trofimuk Institute of Petroleum Geology and Geophysics SB RAS, Novosibirsk, Russia

Since 2004, regular investigations with the use of electrical exploration methods have been conducting by researchers of Institute of Petroleum Geology and Geophysics SB RAS on the territory of the Gorny Altai. The electrotomography method is used to construct geoelectric models of the upper section part to depths of several tens of meters. One of the important tasks of this method is to determine characters of fault zones. Large regional Cenozoic faults are distinguished by significant shifts and are usually well manifested in relief. Intradepression interblock faults overlaid by sedimentary deposits are hard to identify by geological methods, but they are reflected mainly by zones with a reduced value of electrical resistance in sections according to electrotomography data. The paper considers practical examples of the ET method use for studying fault structures of the Gorny Altai. Analysis of the accumulated volume of electrotomography field data allowed researchers to compile typical models simulating the fault structures of this territory. The results of simulated data inversion obtained by numerical modeling of fault zones of the Gorny Altai using well-known third-party programs and proprietary developments are compared. The capabilities of different software systems are analyzed for interpretation of electrotomography data.

Keywords: electrotomography, numerical modeling, Gorny Altai, Chuya valley, fault zones, inversion.

DOI 10.20403/2078-0575-2023-2-41-50

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