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Cross-Borehole ERT: Sensitivity, Model Resolution, and Field Data Quality

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Sensitivity, resolution, and data quality are important parameters to consider when designing an ERT cross-borehole survey. We present an open-source algorithm for computing 2D and 3D sensitivity patterns of any borehole setup and use this to compare single-borehole and different cross-borehole electrode configurations, which both show complex patterns. To study the resolution capability of an entire survey, the model resolution matrix is computed for a field dataset. The dataset is split into different electrode configurations and the model resolution matrices of the different configuration are compared. The results show that the sensitivity and resolution decreases very quickly away from the electrodes, especially for the single-borehole configurations. In the studied field case, this means cross-borehole configurations are needed to correctly image the area between the boreholes, even though the cross-borehole data often are associated with a lower signal-to-noise ratio due to near-zero potential measurements and generally more outliers. The study concludes that in a production mode, where acquisition time and thus the number of possible data points are limited, the combination of electrode configurations must be carefully considered and a trade-off between resolution and data quality must be evaluated.
Original languageEnglish
Publication year2021
Publication statusPublished - 2021
EventEAGE Near Surface Geoscience 2021 - Bordeaux, France
Duration: 30 Aug 20211 Sep 2021
https://eage.eventsair.com/nsg2021/

Conference

ConferenceEAGE Near Surface Geoscience 2021
CountryFrance
CityBordeaux
Period30/08/202101/09/2021
Internet address

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