Sahbi, H. and Jongmans, D. and Charlier, R. (1997) Theoretical study of slope effects in resistivity surveys and applications. Geophysical Prospecting, 45 (5). pp. 795-808.

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When electric soundings are made over an irregular terrain, topographic effects can influence the values of apparent resistivity and lead to erroneous 1D interpretation. A 3D finite-element method has been applied to study the topographical effect of a slope on Schlumberger soundings parallel to the strike. When the resistivity survey is performed at the top of the slope, the apparent resistivity values can be two times higher than in the flat-earth case, depending on the angle (α) and height (H) of the slope, and on the distance (X) between the sounding and the slope top. The results are presented as nondimensional curves which can be used for evaluating topographic anomalies for any value of the parameters α, H and X. It is numerically shown that the topographic effects can be removed from measurements on horizontally layered structures with an irregular earth surface. Real measurements were performed in different geological conditions over an irregular terrain. The correction method based on the nondimensional curves has been applied to the data and has enabled the determination of the correct layered ground configuration using 1D interpretation.

Item Type: Article
Uncontrolled Keywords: Computer simulation; Electric conductivity; Finite element method; Geomorphology; Stratigraphy; Three dimensional, Electric sounding; Slope effects; Topographic effects, Electric prospecting, electrical method; electrical sounding; irregular terrain; resistivity; slope; topography
Subjects: Earth and Planetary Sciences
Divisions: SCIENTIFIC PRODUCTION > Earth and Planetary Sciences
Depositing User: Administrateur Eprints Administrateur Eprints
Last Modified: 31 Jan 2020 15:47

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