Borehole nuclear magnetic resonance as a promising 3D mapping tool in peatland studies

Seyyed Reza Mashhadi; Denys Grombacher; Dominik Zak; Poul Erik Lærke; Hans Estrup Andersen; Carl Christian Hoffmann; Rasmus Jes Petersen

doi:10.1016/j.geoderma.2024.116814

Borehole nuclear magnetic resonance as a promising 3D mapping tool in peatland studies

Seyyed Reza Mashhadi^*, Denys Grombacher, Dominik Zak, Poul Erik Lærke, Hans Estrup Andersen, Carl Christian Hoffmann, Rasmus Jes Petersen

^*Corresponding author for this work

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaper › Journal article › Research › peer-review

4 Citations (Scopus)

Abstract

The potential and limitations of the Borehole Nuclear Magnetic Resonance (BNMR) technique as an in situ measurement for peatland soil characterization was tested in 163 boreholes at four selected peatlands in Denmark. The BNMR data effectively differentiated various geological units in peatland environments due to their distinct NMR responses. Moreover, field-scale variations of the porosity and pore size distribution (e.g., porosity variations within a single geological unit) were mapped to reveal possible trends reflecting geological or hydrogeological conditions in a peatland. Additionally, some of the NMR parameters were found to be correlated with peat decomposition or the degree of humification. The estimation of hydraulic conductivity (K) based on NMR data was also examined for various geological units and compared with slug test measurements. While NMR-based hydraulic conductivity estimations for sand and gyttja (fine-grained sediment with high organic matter) geological units fall within an acceptable range of error, we encountered challenges in achieving reliable estimations for peat. This study showed the potential of BNMR as a robust, rapid, and reliable in situ tool for soil characterization in peatland research.

Original language	English
Article number	116814
Journal	Geoderma
Volume	443
ISSN	0016-7061
DOIs	https://doi.org/10.1016/j.geoderma.2024.116814
Publication status	Published - Mar 2024

Keywords

Degree of decomposition
NMR logging
Peat
Pore size distribution
Porosity

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10.1016/j.geoderma.2024.116814Licence: CC BY

4 Citations
1 Comment/debate/letter to the editor

Corrigendum to “Borehole nuclear magnetic resonance as a promising 3D mapping tool in peatland studies” (Geoderma (2024) 443, (S0016706124000430), (10.1016/j.geoderma.2024.116814))
Reza Mashhadi, S., Grombacher, D., Zak, D., Erik Lærke, P., Estrup Andersen, H., Christian Hoffmann, C. & Jes Petersen, R., Aug 2024, In: Geoderma. 448, 116923.
Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaper › Comment/debate/letter to the editor › Research › peer-review

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title = "Borehole nuclear magnetic resonance as a promising 3D mapping tool in peatland studies",

abstract = "The potential and limitations of the Borehole Nuclear Magnetic Resonance (BNMR) technique as an in situ measurement for peatland soil characterization was tested in 163 boreholes at four selected peatlands in Denmark. The BNMR data effectively differentiated various geological units in peatland environments due to their distinct NMR responses. Moreover, field-scale variations of the porosity and pore size distribution (e.g., porosity variations within a single geological unit) were mapped to reveal possible trends reflecting geological or hydrogeological conditions in a peatland. Additionally, some of the NMR parameters were found to be correlated with peat decomposition or the degree of humification. The estimation of hydraulic conductivity (K) based on NMR data was also examined for various geological units and compared with slug test measurements. While NMR-based hydraulic conductivity estimations for sand and gyttja (fine-grained sediment with high organic matter) geological units fall within an acceptable range of error, we encountered challenges in achieving reliable estimations for peat. This study showed the potential of BNMR as a robust, rapid, and reliable in situ tool for soil characterization in peatland research.",

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doi = "10.1016/j.geoderma.2024.116814",

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AU - Reza Mashhadi, Seyyed

AU - Grombacher, Denys

AU - Zak, Dominik

AU - Lærke, Poul Erik

AU - Estrup Andersen, Hans

AU - Christian Hoffmann, Carl

AU - Jes Petersen, Rasmus

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N2 - The potential and limitations of the Borehole Nuclear Magnetic Resonance (BNMR) technique as an in situ measurement for peatland soil characterization was tested in 163 boreholes at four selected peatlands in Denmark. The BNMR data effectively differentiated various geological units in peatland environments due to their distinct NMR responses. Moreover, field-scale variations of the porosity and pore size distribution (e.g., porosity variations within a single geological unit) were mapped to reveal possible trends reflecting geological or hydrogeological conditions in a peatland. Additionally, some of the NMR parameters were found to be correlated with peat decomposition or the degree of humification. The estimation of hydraulic conductivity (K) based on NMR data was also examined for various geological units and compared with slug test measurements. While NMR-based hydraulic conductivity estimations for sand and gyttja (fine-grained sediment with high organic matter) geological units fall within an acceptable range of error, we encountered challenges in achieving reliable estimations for peat. This study showed the potential of BNMR as a robust, rapid, and reliable in situ tool for soil characterization in peatland research.

AB - The potential and limitations of the Borehole Nuclear Magnetic Resonance (BNMR) technique as an in situ measurement for peatland soil characterization was tested in 163 boreholes at four selected peatlands in Denmark. The BNMR data effectively differentiated various geological units in peatland environments due to their distinct NMR responses. Moreover, field-scale variations of the porosity and pore size distribution (e.g., porosity variations within a single geological unit) were mapped to reveal possible trends reflecting geological or hydrogeological conditions in a peatland. Additionally, some of the NMR parameters were found to be correlated with peat decomposition or the degree of humification. The estimation of hydraulic conductivity (K) based on NMR data was also examined for various geological units and compared with slug test measurements. While NMR-based hydraulic conductivity estimations for sand and gyttja (fine-grained sediment with high organic matter) geological units fall within an acceptable range of error, we encountered challenges in achieving reliable estimations for peat. This study showed the potential of BNMR as a robust, rapid, and reliable in situ tool for soil characterization in peatland research.

KW - Degree of decomposition

KW - NMR logging

KW - Peat

KW - Pore size distribution

KW - Porosity

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DO - 10.1016/j.geoderma.2024.116814

M3 - Journal article

AN - SCOPUS:85185832613

SN - 0016-7061

VL - 443

JO - Geoderma

JF - Geoderma

M1 - 116814

ER -

Borehole nuclear magnetic resonance as a promising 3D mapping tool in peatland studies

Abstract

Keywords

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Research output

Corrigendum to “Borehole nuclear magnetic resonance as a promising 3D mapping tool in peatland studies” (Geoderma (2024) 443, (S0016706124000430), (10.1016/j.geoderma.2024.116814))

Cite this