Abstract:
Small-loop, multi-frequency electromagnetic induction systems (SLEM) are a usual tool for investigating the electrical conductivity and magnetic permeability of the subsurface, up to some tens of meters deep. The data, the in-phase (IP) and quadrature (Q) components of the induced magnetic field, are interpreted by direct observation of the plan views of the responses obtained at each frequency, or by applying 1D inversion methods. Although these systems are really fast, they do not provide data errors. We applied a methodology to estimate these errors in a particular field example, for different system orientations, finding that, regardless of the system orientation, the errors of IP rapidly increase as frequency decreases and are generally much greater than the errors of Q. Though the errors usually increase with decreasing frequency, there can be especially noisy intermediate frequencies. Another important result is that even repeating an acquisition line only three times, good error estimates can be obtained. This could be easily done in field surveys and would be very useful, considering that we also found that including some information about data errors in the 1D inversions, effectively improves the quality of the obtained subsurface images.
Registro:
| Documento: |
Conferencia
|
| Título: | Estimation of data errors for small-loop EM induction systems and how considering them improves 1D inversion results |
| Autor: | Martinelli, H.P.; Robledo, F.E.; BRGM; et al.; INRA; IPGP; IRIS Instruments; Veolia Environment |
| Ciudad: | Paris |
| Filiación: | FCEN, UBA, Argentina
CONICET, Argentina
|
| Palabras clave: | Electromagnetic induction; Estimation; Geology; Magnetic permeability; Direct observations; Electrical conductivity; Error estimates; Induced magnetic fields; Induction system; Intermediate frequencies; Multi frequency; Subsurface images; Errors |
| Año: | 2012
|
| Título revista: | 18th European Meeting of Environmental and Engineering Geophysics of the Near Surface Geoscience Division of EAGE, Near Surface Geoscience 2012
|
| Título revista abreviado: | Near Surf. Geosci.
|
| Registro: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_NIS13062_v_n_p_Martinelli |
Referencias:
- Farquharson, C.G., Oldenburg, D.W., Routh, P.S., Simultaneous 1D inversion of loop-loop electromagnetic data for magnetic susceptibility and electrical conductivity (2003) Geophysics, 68, pp. 1857-1869
- Robledo, F.E., Martinelli, H.P., Bonomo, N.E., Effects of instrument orientation on smallloop electromagnetic induction surveys of localized 2-D conductive targets (2011) Journal of Geophysics and Engineerings, 8, pp. 579-591
- Won, I.J., Small frequency-domain electromagnetic induction sensors (2003) Leading Edge, 22, pp. 320-322
- Won, I.J., Keiswetter, D.A., Fields, G.R.A., Sutton, I.C., Gem-2: A new multifrequency electromagnetic sensor (1996) Journal of Environmental and Engineering Geophysics, 1, pp. 129-138A4 - BRGM; et al.; INRA; IPGP; IRIS Instruments; Veolia Environment
Citas:
---------- APA ----------
Martinelli, H.P., Robledo, F.E. & BRGM; et al.; INRA; IPGP; IRIS Instruments; Veolia Environment
(2012)
. Estimation of data errors for small-loop EM induction systems and how considering them improves 1D inversion results. 18th European Meeting of Environmental and Engineering Geophysics of the Near Surface Geoscience Division of EAGE, Near Surface Geoscience 2012.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_NIS13062_v_n_p_Martinelli [ ]
---------- CHICAGO ----------
Martinelli, H.P., Robledo, F.E., BRGM; et al.; INRA; IPGP; IRIS Instruments; Veolia Environment
"Estimation of data errors for small-loop EM induction systems and how considering them improves 1D inversion results"
. 18th European Meeting of Environmental and Engineering Geophysics of the Near Surface Geoscience Division of EAGE, Near Surface Geoscience 2012
(2012).
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_NIS13062_v_n_p_Martinelli [ ]
---------- MLA ----------
Martinelli, H.P., Robledo, F.E., BRGM; et al.; INRA; IPGP; IRIS Instruments; Veolia Environment
"Estimation of data errors for small-loop EM induction systems and how considering them improves 1D inversion results"
. 18th European Meeting of Environmental and Engineering Geophysics of the Near Surface Geoscience Division of EAGE, Near Surface Geoscience 2012, 2012.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_NIS13062_v_n_p_Martinelli [ ]
---------- VANCOUVER ----------
Martinelli, H.P., Robledo, F.E., BRGM; et al.; INRA; IPGP; IRIS Instruments; Veolia Environment Estimation of data errors for small-loop EM induction systems and how considering them improves 1D inversion results. Near Surf. Geosci. 2012.
Available from: https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_NIS13062_v_n_p_Martinelli [ ]
