You have no items in your shopping cart.
ABSTRACTThe two-dimensional (2D) and three-dimensional (3D) geoelectrical methods of exploration are mostly used in complex and inhomogeneous subsurface media. In a 2D inversion program, the earth is assumed to have a 2D resistivity distribution, that is, resistivity distribution along a 2D vertical (ρ = ρ(y, z)) or horizontal surface (ρ = ρ(x, z)). This implies that subsurface materials thatare not under the imaging plane will not affect or form part of the measured resistivity distribution for that particular 2D vertical or horizontal surface. However, the resistivity distribution of the earth is inherently three-dimensional, that is, ρ = ρ(x, y, z).To establish the similarities and dissimilarities between these two survey methods, three locations were chosen and data were obtained along parallel and orthogonal profiles using the Wenner- Schlumberger array configuration technique. The Wenner-Schlumberger array was chosen for data collection because it has good sensitivity to horizontal and vertical resistivities of structures. The 2D data set (six per location) were analyzed and the resistivity distributions along the vertical and horizontal surfaces for the three different locations were obtained. These vertical and horizontal surfaces for each location were summed up with the use of a batch file (a computer program that was written based on the electrode spread of the survey technique used, the interline electrode spacing between two profiles and the length of the profiles) to form 3D data set for the three different locations and then analyzed to obtain the subsurface resistivity distribution in 3D ((ρ = ρ (x, y, z)). The 3D block images and the 2D slices from the block images were achieved with the use of Voxler. The slices were made so as to draw a proper comparison between the analyzed 2D data and the resulting 3D data.
