Evaluation of the characteristics of various electrode arrays in 2-D electrical prospecting

摘要

It is important to select the electrode array in two-dimensional (2—D) electrical prospecting. The author evaluatedthe characteristics of the pole-pole, pole-dipole, dipole-dipole,Wenner and Eltran arrays on the basis of numerical simulationsand a field experiment. The results are as follows. If the number ofdata used in 2—D inversion is about the same, the dipole-dipolearray gives the highest resolution and the pole-pole array gives thelargest exploration depth. In the dipole-dipole array, it is necessaryto obtain data using various electrode spacing in order to improvethe exploration depth. The dipole-dipole data composed from thepole-pole or pole-dipole data are inaccurate compared with themeasured dipole-dipole data. It is effective to combine the Wennerarray with the dipole-dipole array or the Eltran array in improvingthe accuracy and resolution of 2—D inversion result.