Application of 2D and 3D Geoelectrical Resistivity Imaging for Engineering Site Investigation in a Crystalline Basement Terrain, Southwestern Nigeria
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Springer-Verlag
Abstract
Description
Orthogonal set of 2D geoelectrical resistivity
field data, consisting of six parallel and five perpendicular
profiles, were collected in an investigation site using the
conventional Wenner array. Seven Schlumberger soundings
were also conducted on the site to provide ID layering
information and supplement the orthogonal 2D profiles.
The observed 2D apparent resistivity data were first processed
individually and then collated into 3D data set
which was processed using a 3D inversion code. The 3D
model resistivity images obtained from the inversion are
presented as horizontal depth slices. Some distortions
observed in the 2D images from the inversion of the 2D
profiles are not observed in the 2D images extracted from
the 3D inversion. The survey was conducted with the aim
of investigating the degree of weathering and fracturing in
the weathered profile, and thereby ascertaining the suitability
of the site for engineering constructions as well as
determining its groundwater potential.
Keywords
QC Physics, QE Geology