Estimation of hydraulic conductivity variations within glacial sediments at Endelave island by borehole NMR data

TY - GEN

T1 - Estimation of hydraulic conductivity variations within glacial sediments at Endelave island by borehole NMR data

AU - Mashhadi, S. R.

AU - Grombacher, D.

AU - Pedersen, J. B.

AU - Jørgensen, F.

AU - Andersen, T. R.

AU - Griffiths, M. P.

N1 - Publisher Copyright: © 30th European Meeting of Environmental and Engineering Geophysics, Held at the Near Surface Geoscience Conference and Exhibition 2024, NSG 2024.

PY - 2024

Y1 - 2024

N2 - Geological models and hydrological data serve as fundamental inputs for hydrogeological modelling assessments. In this context, slug tests are commonly employed to acquire hydrological properties of soils. However, in studying complex hydrogeological systems, obtaining enough hydraulic conductivity measurements in multiple depth intervals pose challenges. To address this challenge on Endelave Island, we utilized Borehole Nuclear Magnetic Resonance (BNMR) geophysical methods to indirectly obtain high resolution (10s of centimeters scale) hydraulic conductivity values. Additionally, we conducted slug test measurements to ensure consistency between the estimations and real hydrological properties of soil. The geological units encountered in the boreholes comprise a sequence of glacial sediments, including clay, till, and sand, deposited within a buried valley. BNMR data successfully differentiated between sandy geological units and till or clayey units. We also observed that BNMR data can reflect changes in sorting and grain size within these geological units, as these factors significantly influence pore size distribution. Moreover, the analysis revealed the effectiveness of the BNMR technique for predicting hydraulic conductivity in glacial sediments.

AB - Geological models and hydrological data serve as fundamental inputs for hydrogeological modelling assessments. In this context, slug tests are commonly employed to acquire hydrological properties of soils. However, in studying complex hydrogeological systems, obtaining enough hydraulic conductivity measurements in multiple depth intervals pose challenges. To address this challenge on Endelave Island, we utilized Borehole Nuclear Magnetic Resonance (BNMR) geophysical methods to indirectly obtain high resolution (10s of centimeters scale) hydraulic conductivity values. Additionally, we conducted slug test measurements to ensure consistency between the estimations and real hydrological properties of soil. The geological units encountered in the boreholes comprise a sequence of glacial sediments, including clay, till, and sand, deposited within a buried valley. BNMR data successfully differentiated between sandy geological units and till or clayey units. We also observed that BNMR data can reflect changes in sorting and grain size within these geological units, as these factors significantly influence pore size distribution. Moreover, the analysis revealed the effectiveness of the BNMR technique for predicting hydraulic conductivity in glacial sediments.

UR - http://www.scopus.com/inward/record.url?scp=85214811686&partnerID=8YFLogxK

U2 - 10.3997/2214-4609.202420047

DO - 10.3997/2214-4609.202420047

M3 - Article in proceedings

AN - SCOPUS:85214811686

BT - 30th European Meeting of Environmental and Engineering Geophysics, Held at the Near Surface Geoscience Conference and Exhibition 2024, NSG 2024

PB - European Association of Geoscientists and Engineers, EAGE

T2 - 30th European Meeting of Environmental and Engineering Geophysics, Held at the Near Surface Geoscience Conference and Exhibition 2024, NSG 2024

Y2 - 8 September 2024 through 12 September 2024

ER -