Article (Scientific journals)
Quantitative interpretation of geoelectric inverted data with a robust probabilistic approach
Isunza Manrique, Itzel; Caterina, David; Nguyen, Frédéric et al.
2023In Geophysics
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Keywords :
landfill; probabilistic interpretation; geoelectric data; classification; induced polarization
Abstract :
[en] The nonuniqueness of the solution to the geophysical inverse problem can lead to misinterpretation while characterizing the subsurface. To tackle this situation, ground-truth information from excavations and wells can be used to improve, calibrate, and interpret inverted models. We refer to quantitative interpretation as the decision analysis based on probability theory, which is focused on solving a classification problem. First, we present a probabilistic approach to classify the different types of materials or “categories” observed in borehole logs using multiple data sources: inverted 2D electrical resistivity tomography and induced polarization data and the positions (x, z) of these boreholes. Then, using the Bayes’ rule and permanence of ratios, we compute the joint conditional probabilities of each category, given all data sources in the whole inverted model domain. We validate this approach with synthetic data modeling for a complex anthropogenic-geologic scenario and using real data from an old landfill. Afterward, we assess the performance of the probabilistic approach for classification and compare it with the machine learning algorithm of multilayer perceptron (MLP). In addition, we analyze the effect that the different data sources and the number of boreholes (and their distribution) have on both approaches with the synthetic case. Our results indicate that the MLP performance is better for delineating the different categories where the lateral contrasts in the synthetic resistivity model are small. Nevertheless, the classification obtained with the probabilistic approach using real data seems to provide a more geologically realistic distribution. We conclude that the probabilistic approach is robust for classifying categories when high spatial heterogeneity is expected and when ground-truth data are limited or not sparsely distributed. Finally, this approach can be easily extended to integrate multiple geophysical methods and does not require the optimization of hyperparameters as for MLP.
Disciplines :
Earth sciences & physical geography
Author, co-author :
Isunza Manrique, Itzel ;  Université de Liège - ULiège > Urban and Environmental Engineering
Caterina, David  ;  Université de Liège - ULiège > Urban and Environmental Engineering
Nguyen, Frédéric ;  Université de Liège - ULiège > Département ArGEnCo > Géophysique appliquée
Hermans, Thomas;  UGent - Ghent University [BE]
Language :
English
Title :
Quantitative interpretation of geoelectric inverted data with a robust probabilistic approach
Publication date :
20 April 2023
Journal title :
Geophysics
ISSN :
0016-8033
eISSN :
1942-2156
Publisher :
Society of Exploration Geophysicists, United States
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 29 July 2023

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