Abstract
The calculation of apparent resistivity in electrical methods is relatively simple and consolidated in the literature. Furthermore, in the case of DC methods, the apparent resistivity values are for the most part, intuitive and enable an initial interpretation of the results. On the other hand, in TEM method the apparent resistivity values are not very intuitive and interpretation based only on the apparent resistivity values cannot be done reasonably. In this way, this paper presents a discussion about the reasons and effects of the negatives values of apparent resistivity in TEM soundings. The main objective of this paper is to clarify the meanings of these negatives values and the possible effects in TEM inversion.
Highlights
The concept of apparent resistivity is widely used in electrical and electromagnetic geophysical methods
In the case of DC methods, the apparent resistivity values are for the most part, intuitive and enable an initial interpretation of the results
This paper presents a discussion about the reasons and effects of the negatives values of apparent resistivity in Transient Electromagnetic (TEM) soundings
Summary
The concept of apparent resistivity is widely used in electrical and electromagnetic geophysical methods This concept originates in the sense that the calculations of the electrical resistivity measured by these methods assume a homogeneous medium as a reference. In the case of electrical methods, the calculation of the apparent resistivity ends up being simpler compared to electromagnetic methods. Another advantage when working with apparent resistivity in electrical methods is that the values obtained are intuitive and allow some types of interpretations directly. A more complex situation in relation to the calculation of apparent resistivity of the TEM method occurs with the use of data measured inside and outside of the transmitter loop in 1D and 2D surveys. With the main objective clarifies the meaning of these values and the effects on TEM inversion
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