Geological and structural characterizations of a basaltic environment by vertical electrical soundings and multifractal
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Geological and structural characterizations of a basaltic environment by vertical electrical soundings and multifractal modeling techniques in Deir El‑Adas Area, Yarmouk Basin, Syria Jamal Asfahani1 · Walid Al‑Fares1 Received: 9 June 2020 / Accepted: 18 September 2020 © Akadémiai Kiadó 2020
Abstract Concentration-number (C-N) fractal modeling technique is adapted and newly proposed to interpret vertical electrical sounding (VES) measurements. This proposed technique is practiced herein on a case study taken from Deir El-Adas, Southern Syria, where four VES geoelectrical profiles (Pro-1, Pro-2, Pro-3, and Pro-4) are interpreted. The general targeting concept of this technique is to use the threshold break points determined by the use of C-N log–log plots to indicate the passage from geoelectrical layer to another one. Different apparent resistivity population ranges are accordingly well determined for the treated geoelectrical data. Those apparent resistivity ranges are consequently used to establish 2D and 3D semi quantitative interpretations of the studied geoelectrical profiles for different fixed spacings AB/2. The established geoelectrical sections clarified the subsurface geological structures and contributed in distinguishing and classifying lateral and vertical different type of basaltic features in the study area. The fractal C-N model can be therefore used to calibrate the ID traditional inversion VES interpretation, particularly in basaltic environments, characterized by sharp and rapid resistivity variations. This calibration is one of the advantages of this fractal technique. This technique is therefore recommended to be applied in other similar basaltic environments. Keywords Multifractal modeling · Basalt environment · VES survey · Yarmouk Basin · Syria
1 Introduction Traditional Vertical Electrical Sounding (VES) technique with Schlumberger configuration is widely used for solving different subsurface geological problems such as the groundwater exploration (Edwards 1977; Zohdy et al. 1984). Real resistivities and thicknesses can be determined under every studied VES point through interpreting quantitatively the * Jamal Asfahani [email protected] 1
Department of Geology, Atomic Energy Commission of Syria, Damascus, Syria
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Vol.:(0123456789)
Acta Geodaetica et Geophysica
VES measurements by adapting the 1D concept (Zohdy and Bisdorf 1989). The 1D resulting model under every studied VES point is thereafter used in order to qualitatively establishing the 2D subsurface geoelectrical section along a given profile. However, getting an accurate 2D geoelectrical section is not an easy task, particularly in basaltic environments, characterized by very sharp resistivity variations laterally and vertically. In addition, the acquired and gained experiences indicate that the basalt of southern Syria is generally characterized by a very heterogenic permeability, where the groundwater is moving through big fissures and channels that are randomly distributed. The 2D interpretations along a giv
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