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Abstract

Summary

Three-dimensional resistivity and I.P surveys are widely used in mineral exploration to map the conductive minerals associated with base and precious metals deposits. Several field survey strategies have been designed to reduce the survey cost such as the offset pole-dipole array. Another method is the vector array where triplets of potential electrodes at placed at each station. Two measurements that are approximately at right angles are made of the electric field at each station. In some cases, one potential dipole is almost on an equipotential line. This results in an array configuration with a low measured potential value which is sensitive to noise, and in some cases a negative apparent resistivity value. The logarithm of the apparent resistivity is commonly used as the data parameter in inversion algorithms as the values in a data set can vary by several orders of magnitude. However, this is not possible if negative values are present. Instead of treating the two vector measurements as separate data points, they can be combined into amplitude and direction values. The amplitude is always positive and is less sensitive to noise compared to the individual components. This results in a more stable inversion algorithm.

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/content/papers/10.3997/2214-4609.201902361
2019-09-08
2024-04-24

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The Inversion of Vector Array Data Sets for 3-D Resistivity and I.P. Surveys
Conference Proceedings 2019, 1 (2019); https://doi.org/10.3997/2214-4609.201902361
/content/papers/10.3997/2214-4609.201902361
/content/papers/10.3997/2214-4609.201902361
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