Automated Geophysical Field Calculator Using Schlumberger Electrode System

Dannity Oseyande Isiwele, Jackson Akpojaro, Celestine Uche Agwi

Abstract


The aim of this paper is to present a fast and direct approach for solving the geometric factor (k) and the Apparent Resistivity (ρa) for the Schlumberger electrode configurations in geo-electric field surveys, using the measured quantities of the current electrode and potential electrode spacing respectively. The program is a web-based development based on scripting. Swish script is the major driver alongside the hypertext markup language (html), developed and housed in flash-java containers. The main features are the potential electrode spacing (M,N), current electrode spacing (A,B), the instant resistance reading (V/I (Ω)) (is the reading from the measuring device, usually a resistivity meter), the Geometric factor (k) and the Apparent Resistivity ( ).The ability of the program to modify basic quantities like current electrode spacing, the potential electrode spacing and the V/I to suit individual field practice with respect to the lateral and vertical variations in the inhomogeneous media made it a unique program. On execution of the program, it was found that both the geometric factor (k) and the apparent resistivity (  ) values are automatically displayed once the respective field data were inputted and the execute button clicked accordingly.  It was tested for values of L = 1.0, 1.47,…,100 and l = 0.5, …,500. Finally a standard field sheet was incorporated into the program to reduce the monotony of numbering.


Keywords


Apparent Resistivity (ρa); Geometric factor (k); Potential electrode spacing (l); Current electrode spacing (L); flash content; Homogeneous media; Lateral variations.

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