The results of ground shallow depth frequency sounding at the geoelectric test site of Institute of Petroleum Geology and Geophysics (SB RAS)
Category: 14-3
UDC 550.837.61
E.V. Balkov, T.A. Stoykin, A.K. Manstein, Y.G. Karin
Institute of Petroleum Geology and Geophysics of Siberian Branch
of Russian Academy of Science,
Novosibirsk, Russia
Abstract
Results of electromagnetic sounding conducted using multi-frequency equipment at the geoelectric test site of the Institute of Petroleum Geology and Geophysics (Novosibirsk, IPGG SB RAS) are presented. The test site, constructed for studying resolution of geophysical equipment for electromagnetic measurements and improving the methodical base of field works, consists of ten 100 m2 squares with 33 inserted targets.
A study of real or imaginary components of the signal demonstrated that objects located at the depth over 1.5m are generally detected with the real component measurements, while objects at the depth of 0.5–1.5 m are detected more distinctly with the imaginary component measurements. Metal and other contrast objects at various depths and positions can create over three extremums on plots and maps, which leads to difficulties in interpreting this material.
The phase of differential signal distribution appears to be an efficient way to display the field data.
Keywords: frequency sounding, measuring approach, response interpretation, geophysical test site.
References
Balkov, E.V. and Manshtein, A.K., Three-coil induction probes in frequency sounding, Geofizichesky vestnik, 2001, no. 12, pp. 17–20.
Balkov, E.V., Epov, M.I., and Manshtein, A.K., Assessment of ground EM inductive sounding distance, Geofizika, 2006, no. 3, pp. 41–44.
Balkov, E.V., Multiple signatures in the signal from local objects under electromagnetic profiling with a compact probe with spaced coils, 5th Russian M.N. Berdichevsky and L.L. Vanyan workshop on electromagnetic sounding of the Earth, Saint Petersburg, SPb, 2011a, p. 4.
Balkov, E.V., Shallow frequency sounding technique, Geofizika, 2011b, no. 6, pp. 42–47.
Bosmar, M., Why did Geonics Limited Build the EM61-MK2? Comparison Between EM61-MK2 and EM61, Geonics Limited Technical Note TN 33, 2001, November.
Manshtein, A.K., Panin, G.L., and Tikunov, S.Yu., EMS equipment for EM frequency sounding, Russian Geology and Geophysics, 2008, no. 6, pp. 571–579.
Svetov, B.S., Theory, methods and interpretation of low-frequency inductive survey, Moscow: Nedra, 1973, 254 p.
Won, J., Keiswetter, D.A., Hanson, D.R., Novikova, E. and Hall T.M., GEM-3: A monostatic broadband electromagnetic induction sensor, J. Environmental Engineering Geophys., 1997, vol. 2, pp. 53–64.