A machine learning framework for low-field NMR data processing

Sihui Luo

doi:10.1016/j.petsci.2022.02.001

2022-04-01

DOI：10.1016/j.petsci.2022.02.001

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摘要

En 中文

Low-field (nuclear magnetic resonance) NMR has been widely used in petroleum industry, such as well logging and laboratory rock core analysis. However, the signal-to-noise ratio is low due to the low magnetic field strength of NMR tools and the complex petrophysical properties of detected samples. Suppressing the noise and highlighting the available NMR signals is very important for subsequent data processing. Most denoising methods are normally based on fixed mathematical transformation or handdesign feature selectors to suppress noise characteristics, which may not perform well because of their non-adaptive performance to different noisy signals. In this paper, we proposed a ???data processing framework??? to improve the quality of low field NMR echo data based on dictionary learning. Dictionary learning is a machine learning method based on redundancy and sparse representation theory. Available information in noisy NMR echo data can be adaptively extracted and reconstructed by dictionary learning. The advantages and application effectiveness of the proposed method were verified with a number of numerical simulations, NMR core data analyses, and NMR logging data processing. The results show that dictionary learning can significantly improve the quality of NMR echo data with high noise level and effectively improve the accuracy and reliability of inversion results. ?? 2022 The Authors. Publishing services by Elsevier B.V. on behalf of KeAi Communications Co. Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/ 4.0/).

Keyword:

Dictionary learning

Low-field NMR

Denoising

Data processing

T 2 distribution