Problems of detecting buried 3D objects with 2D geoelectric profiling methods

Plank, Zsuzsanna (2003) Problems of detecting buried 3D objects with 2D geoelectric profiling methods. In: Extended Abstracts of the 65th EAGE Conference & Exhibition. European Association of Geoscientists and Engineers (EAGE), Houten, P095. ISBN 90-73781-25-6

Preview

Text EAGE__2003_3D_2D_u.pdf Download (340kB) | Preview

Abstract

Detection of near-surface buried objects is usually ca rried out along one or more survey lines and processed by 2D algorithms. Problems appear if the target is three-dimensional. The sensitivity for the 3D effects near the profile strongly depends on the configuration of the electrodes, the three-dimensional object situ ated under the survey line is also mapped differently to the 2D plane. The indications of 3D objects on a 2D-resistivity section are specific for each electrode configuration. Theoretical calculations simulating 2D geoele ctrical surveys above 3D objects have been carried out in order to examine this problem in the cases of four different electrode arrays (pole-pole, dipole-dipole, equa torial dipole, Wenner alpha). The results of the modeling processes made it possible to rank the examined arrays from the point of sensitivity for 3D effects and quality of imaging the object. Test measurements have been carried out in order to prove the conclusions of the theoretical investigations. Two perpendicula r survey lines have been m easured above a buried cellar using dipole-dipole, pole-pole and Wenner arra ys. The 2D pseudosections were compared with the results of GPR and 3D geoelectric measurements.

Actions (login required)

Edit Item