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Improving the Resolution of ERT Arrays Acquired with Few Electrodes from Mixing Concatenated Sections after Small Lateral DisplacementsNormal access

Authors: A. Urruela, M. Himi, R. Lovera, L. Rivero, R. García, F. Pinheiro Lima Filho and A. Casas
Event name: 24th European Meeting of Environmental and Engineering Geophysics
Session: Monitoring and Characterization A
Publication date: 09 September 2018
DOI: 10.3997/2214-4609.201802643
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 730.78Kb )
Price: € 20

Summary:
The success of a subsurface exploration survey using ERT method depends largely on physical properties contrast, the complexity of target to be imaged and electronic array used. In this case, it is very important to consider the resolution and depth of research that can be achieved. On the one hand, the resolution depends on the spacing between the measuring points, which in turn depends on the number of electrodes available on the multielectrode resistivity meter used, while the penetration depth is a function of the separation between the current electrodes placed at both ends of the profile. Then, for an instrument with low number of electrodes, there is a compromise between resolution and penetration. This restriction can be mitigated by using an array with enough extension for achieve the needed exploration depth and repeating the profile as many times as necessary with a lag equivalent to the spacing between adjacent electrodes needed for achieve the required resolution.


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