Hydrogeological Characterization Of Crystalline Bedrock Using Borehole Magnetic Resonance At A Mining Development Site, Northern Finland
The Borehole Magnetic Resonance (BMR) method was tested for measuring porosity and estimating groundwater flow parameters required for hydrogeological modelling in a crystalline rock setting at the Sakatti Ni‐Cu‐PGE mining project site in Northern Finland. The characterization of hydraulic propertie...
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ftunivhelsihelda:oai:helda.helsinki.fi:10138/336187 2024-01-07T09:45:27+01:00 Hydrogeological Characterization Of Crystalline Bedrock Using Borehole Magnetic Resonance At A Mining Development Site, Northern Finland Eeva, Salla Talvikki Koivisto, Emilia Korkka-Niemi, Kirsti Rautio, Anne Gee, Ryan Department of Geosciences and Geography Teachers' Academy 2021-11-10T12:42:02Z 2 application/pdf http://hdl.handle.net/10138/336187 eng eng Eeva , S T , Koivisto , E , Korkka-Niemi , K , Rautio , A & Gee , R 2021 , ' Hydrogeological Characterization Of Crystalline Bedrock Using Borehole Magnetic Resonance At A Mining Development Site, Northern Finland ' , 48th IAH Congress , Brussels , Belgium , 06/09/2021 - 10/09/2021 pp. 52-53 . conference ORCID: /0000-0002-1485-6307/work/102968397 ORCID: /0000-0002-5003-1943/work/102970164 81f8b726-592b-4dd4-bb1f-d0776acc83e6 http://hdl.handle.net/10138/336187 openAccess info:eu-repo/semantics/openAccess 1171 Geosciences hydrogeology Geophysics Structural geology Abstract publishedVersion 2021 ftunivhelsihelda 2023-12-14T00:03:52Z The Borehole Magnetic Resonance (BMR) method was tested for measuring porosity and estimating groundwater flow parameters required for hydrogeological modelling in a crystalline rock setting at the Sakatti Ni‐Cu‐PGE mining project site in Northern Finland. The characterization of hydraulic properties of deep bedrock, shallow fractured bedrock, surficial deposits as well as groundwater and surface water flow patterns and interactions between them is informative already during ore prospecting phase. Although BMR is widely used for determining storage and flow properties in sedimentary rocks forming hydrocarbon reservoirs, there have been few studies in basement rocks as described here. The BMR method allows the detection of water in the subsurface by applied electromagnetic fields in a continuous manner with decimetre‐scale measurements along the boreholes. The measured response is inverted to give a continuous distribution of relaxation time T2 which is a direct measure of the amount of water, or pore volume. This can further be divided into bound water and free water using specific cut‐off values for each lithology, which can then be used to calculate estimates of hydraulic conductivity. The Sakatti Cu‐Ni‐PGE deposit, located several hundred meters below the Natura2000‐protected Viiankiaapa mire, displays complex and heterogeneous subsurface geology, hydrogeology and deformational history. The BMR data was acquired from six drillholes in order to obtain specific information about the structural heterogeneity and free water content within the depth interval of 50 to 360m, and thus estimations of the local flow parameters. Other available survey data, such as natural gamma ray, acoustic image data, core logging and packer tests were compared with the BMR data in order to compare and calibrate the groundwater flow parameters calculated based on these measurements. The initial results indicate that BMR is a suitable tool for studying lithologically and hydrogeologically heterogeneous fractured crystalline rocks. ... Article in Journal/Newspaper Northern Finland HELDA – University of Helsinki Open Repository |
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HELDA – University of Helsinki Open Repository |
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ftunivhelsihelda |
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English |
topic |
1171 Geosciences hydrogeology Geophysics Structural geology |
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1171 Geosciences hydrogeology Geophysics Structural geology Eeva, Salla Talvikki Koivisto, Emilia Korkka-Niemi, Kirsti Rautio, Anne Gee, Ryan Hydrogeological Characterization Of Crystalline Bedrock Using Borehole Magnetic Resonance At A Mining Development Site, Northern Finland |
topic_facet |
1171 Geosciences hydrogeology Geophysics Structural geology |
description |
The Borehole Magnetic Resonance (BMR) method was tested for measuring porosity and estimating groundwater flow parameters required for hydrogeological modelling in a crystalline rock setting at the Sakatti Ni‐Cu‐PGE mining project site in Northern Finland. The characterization of hydraulic properties of deep bedrock, shallow fractured bedrock, surficial deposits as well as groundwater and surface water flow patterns and interactions between them is informative already during ore prospecting phase. Although BMR is widely used for determining storage and flow properties in sedimentary rocks forming hydrocarbon reservoirs, there have been few studies in basement rocks as described here. The BMR method allows the detection of water in the subsurface by applied electromagnetic fields in a continuous manner with decimetre‐scale measurements along the boreholes. The measured response is inverted to give a continuous distribution of relaxation time T2 which is a direct measure of the amount of water, or pore volume. This can further be divided into bound water and free water using specific cut‐off values for each lithology, which can then be used to calculate estimates of hydraulic conductivity. The Sakatti Cu‐Ni‐PGE deposit, located several hundred meters below the Natura2000‐protected Viiankiaapa mire, displays complex and heterogeneous subsurface geology, hydrogeology and deformational history. The BMR data was acquired from six drillholes in order to obtain specific information about the structural heterogeneity and free water content within the depth interval of 50 to 360m, and thus estimations of the local flow parameters. Other available survey data, such as natural gamma ray, acoustic image data, core logging and packer tests were compared with the BMR data in order to compare and calibrate the groundwater flow parameters calculated based on these measurements. The initial results indicate that BMR is a suitable tool for studying lithologically and hydrogeologically heterogeneous fractured crystalline rocks. ... |
author2 |
Department of Geosciences and Geography Teachers' Academy |
format |
Article in Journal/Newspaper |
author |
Eeva, Salla Talvikki Koivisto, Emilia Korkka-Niemi, Kirsti Rautio, Anne Gee, Ryan |
author_facet |
Eeva, Salla Talvikki Koivisto, Emilia Korkka-Niemi, Kirsti Rautio, Anne Gee, Ryan |
author_sort |
Eeva, Salla Talvikki |
title |
Hydrogeological Characterization Of Crystalline Bedrock Using Borehole Magnetic Resonance At A Mining Development Site, Northern Finland |
title_short |
Hydrogeological Characterization Of Crystalline Bedrock Using Borehole Magnetic Resonance At A Mining Development Site, Northern Finland |
title_full |
Hydrogeological Characterization Of Crystalline Bedrock Using Borehole Magnetic Resonance At A Mining Development Site, Northern Finland |
title_fullStr |
Hydrogeological Characterization Of Crystalline Bedrock Using Borehole Magnetic Resonance At A Mining Development Site, Northern Finland |
title_full_unstemmed |
Hydrogeological Characterization Of Crystalline Bedrock Using Borehole Magnetic Resonance At A Mining Development Site, Northern Finland |
title_sort |
hydrogeological characterization of crystalline bedrock using borehole magnetic resonance at a mining development site, northern finland |
publishDate |
2021 |
url |
http://hdl.handle.net/10138/336187 |
genre |
Northern Finland |
genre_facet |
Northern Finland |
op_relation |
Eeva , S T , Koivisto , E , Korkka-Niemi , K , Rautio , A & Gee , R 2021 , ' Hydrogeological Characterization Of Crystalline Bedrock Using Borehole Magnetic Resonance At A Mining Development Site, Northern Finland ' , 48th IAH Congress , Brussels , Belgium , 06/09/2021 - 10/09/2021 pp. 52-53 . conference ORCID: /0000-0002-1485-6307/work/102968397 ORCID: /0000-0002-5003-1943/work/102970164 81f8b726-592b-4dd4-bb1f-d0776acc83e6 http://hdl.handle.net/10138/336187 |
op_rights |
openAccess info:eu-repo/semantics/openAccess |
_version_ |
1787426989116751872 |