Deep learning for lithological classification of carbonate rock micro-CT images

In addition to the ongoing development, pre-salt carbonate reservoir characterization remains a challenge, primarily due to inherent geological particularities. These challenges stimulate the use of well-established technologies, such as artificial intelligence algorithms, for image classification t...

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Bibliographic Details
Published in:Computational geosciences 2021-06, Vol.25 (3), p.971-983
Main Authors: dos Anjos, Carlos E. M., Avila, Manuel R. V., Vasconcelos, Adna G. P., Pereira Neta, Aurea M., Medeiros, Lizianne C., Evsukoff, Alexandre G., Surmas, Rodrigo, Landau, Luiz
Format: Article
Language:English
Subjects:
Algorithms
Artificial intelligence
Artificial neural networks
Carbonate rocks
Carbonates
Classification
Computed tomography
Deep learning
Earth and Environmental Science
Earth Sciences
Evaluation
Geotechnical Engineering & Applied Earth Sciences
Hydrogeology
Image classification
Learning algorithms
Lithology
Machine learning
Mathematical Modeling and Industrial Mathematics
Model accuracy
Neural networks
Original Paper
Salts
Soil Science & Conservation
Workflow
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Summary:In addition to the ongoing development, pre-salt carbonate reservoir characterization remains a challenge, primarily due to inherent geological particularities. These challenges stimulate the use of well-established technologies, such as artificial intelligence algorithms, for image classification tasks. Therefore, this work intends to present an application of deep learning techniques to identify lithological patterns in Brazilian pre-salt carbonate rocks using microtomographic images. Four convolutional neural network models were proposed. The first model includes three convolutional layers, followed by a fully connected layer. This model is used as a base model for the following proposals. In the next two models, we replace the max pooling layer with a spatial pyramid pooling and a global average pooling layer. The last model uses a combination of spatial pyramid pooling followed by global average pooling in place of the final pooling layer. All models are compared using original images, when possible, as well as resized images. The dataset consists of 6,000 images from three different classes. The model performances were evaluated by each image individually, as well as by the most frequently predicted class for each sample. According to accuracy, Model 2 trained on resized images achieved the best results, reaching an average of 75.54% for the first evaluation approach and an average of 81.33% for the second. We developed a workflow to automate and accelerate the lithology classification of Brazilian pre-salt carbonate samples by categorizing microtomographic images using deep learning algorithms in a non-destructive way.
ISSN:1420-0597
1573-1499
DOI:10.1007/s10596-021-10033-6