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Efeito De Pequenas Distâncias Entre Os Eletrodos De Corrente Em Perfis Elétricos Com Arranjo Gradiente
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 7th International Congress of the Brazilian Geophysical Society, Oct 2001, cp-217-00098
Abstract
Over the years Gradient Arrays have been used in<br>resistivity profiling surveys over hard rocks in order<br>to locate fracture zones in both efficient and<br>inefficient ways, for groundwater prospecting. Many<br>of the unsuccessful applications are due to small<br>current electrode distance (AB). In this paper we<br>study the depth of investigation for the gradient array<br>and perform some numerical examples to show the<br>effect of the use of such small distance in the obtained<br>profiles. We see that when a small AB distance is<br>used, as soon as the location of the potential<br>electrodes changes, the depth of investigation of the<br>array is also changed, and so, a profile/sounding<br>curve is obtained, leading many times, in a<br>misinterpretation of the profile curves.