Three-dimensional forward modeling and quantitative assessment of electrode offset effects in ERT
Kui Suo, Mingdong Zhao, Menghan Jia, Wenhui Liu, Shizhong Chen, Guizhang Zhao
TL;DR
This paper investigates how electrode offsets and topography affect resistivity measurements, offering insights to improve geophysical data interpretation.
Contribution
The study introduces a 3D forward modeling approach to quantify electrode offset effects and topographic distortions in resistivity data.
Findings
Horizontal electrode offsets create pseudo-anomalies in resistivity responses, influenced by offset angles and electrode numbers.
Topographical variations distort apparent resistivity curves and anomaly locations, especially near target body edges.
The study identifies gradient variation patterns in horizontal offsets and anomalous response laws under different topographic conditions.
Abstract
Resistivity data has important applications in geophysical exploration, but the impact of electrode offsets on resistivity response characteristics remains unclear. This study aims to explore the influence of horizontal electrode offset angles and vertical offsets caused by topographical variations on the forward modeling of resistivity data. By analyzing experimental models with different measurement arrays, the paper revealed their influence laws on the buried depth of the target body and resistivity resolution. Utilizing tools like ZondRes3D, we conducted 3D resistivity forward modeling and analyzed the results in detail. It is found that horizontal electrode offsets lead to pseudo-anomalies in the apparent resistivity response, which is related to the offset angles and the number of electrodes. Under different conditions, the horizontal electrode offsets exhibit a “gradient…
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Taxonomy
TopicsGeophysical and Geoelectrical Methods · Geophysical Methods and Applications · Seismic Waves and Analysis