TDEM and VES soundings applied to a hydrogeological study in the central region of the Taubaté Basin, Brazil
Luiz Rodrigo Hamada, Jorge Luís Porsani and Cassiano Antonio Bortolozo
Journal name: First Break
Issue: Vol 36, No 8, August 2018 pp. 49 - 54
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The use of TDEM data for hydrogeological studies has increased substantially in the last few years owing to its versatility and sensitivity, which helps to determine conductor layers in the subsurface. It has been a very useful method for deep investigations, but its application has been limited for investigation of shallow layers. VES is an important eletroresistivity technique for detecting the contrast between conductive and resistive layers at shallow depths. Thus, VES and TDEM corroborate with geoelectrical information to provide the best understanding of the subsurface geology. Previous work has shown how the TDEM method and VES technique are useful for mapping sedimentary aquifers and for searching fracture zones filled with water (Almeida, 2011; Almeida et al., 2017; Bortolozo, 2011; Porsani et al., 2012a, 2012b; Leite, 2013; Bortolozo et al., 2014, 2015; Couto, 2015; Campaña, 2015; Campaña et al., 2017; Bortolozo, 2016; Leite et al., 2018; Rangel et al., 2018). The main objectives of this research are to map the geoelectrical stratigraphy of the Taubaté basin, in order to identify the saturated sedimentary zones (Aquifer and/or Aquiclude), to estimate the depth of the contact between the Quaternary and Tertiary sediments and to infer the top of the basement in the central region of the Taubaté basin.