Impact of Paramagnetic Minerals on NMR-Converted Pore Size Distributions in Permian Carynginia Shales
Pore size distribution (PSD) is a fundamental petrophysical parameter for shale formation evaluation. Nuclear magnetic resonance (NMR), performing as a widely acknowledged technique, directly measures transverse relaxation time (T2), which can be converted into PSD via surface relaxivity (SR). Techn...
| Main Authors: | , |
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| Format: | Journal Article |
| Language: | English |
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AMER CHEMICAL SOC
2019
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| Subjects: | |
| Online Access: | http://hdl.handle.net/20.500.11937/89572 |
| _version_ | 1848765248811565056 |
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| author | Yuan, Yujie Rezaee, Reza |
| author_facet | Yuan, Yujie Rezaee, Reza |
| author_sort | Yuan, Yujie |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | Pore size distribution (PSD) is a fundamental petrophysical parameter for shale formation evaluation. Nuclear magnetic resonance (NMR), performing as a widely acknowledged technique, directly measures transverse relaxation time (T2), which can be converted into PSD via surface relaxivity (SR). Technically, SR is utilized as a constant value in the entire formation, nevertheless, the laboratory calculated SRs revealed that they are likely to vary with mineralogy and can be influenced by Fe-bearing paramagnetic minerals, which could further affect NMR-converted pore structure properties. This study was performed on Permian Carynginia shale samples to compare the NMR-converted PSD with that measured by mercury injection capillary pressure (MICP). The surface relaxivity was calculated from the logarithmic mean T2 value (T2,lm) based on NMR measurement and the surface to volume ratio (SVR) based on low-pressure nitrogen gas adsorption (LP-N2-GA). The results show that Fe-bearing paramagnetic mineral contents are linear positively correlated with SR values, which were calculated to range between 0.08 and 0.32 μm/s in our tested samples. The paramagnetic mineral of higher content expedites the NMR T2 surface relaxation rate, leading to the divergent shifts in NMR- converted PSD curves. |
| first_indexed | 2025-11-14T11:32:14Z |
| format | Journal Article |
| id | curtin-20.500.11937-89572 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-14T11:32:14Z |
| publishDate | 2019 |
| publisher | AMER CHEMICAL SOC |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-895722022-11-14T05:58:16Z Impact of Paramagnetic Minerals on NMR-Converted Pore Size Distributions in Permian Carynginia Shales Yuan, Yujie Rezaee, Reza Science & Technology Technology Energy & Fuels Engineering, Chemical Engineering NUCLEAR-MAGNETIC-RESONANCE CLAY BOUND WATER SURFACE RELAXIVITY GAS-ADSORPTION POROSITY MEASUREMENT NITROGEN ADSORPTION FRACTAL ANALYSIS ORGANIC-MATTER AREA POROSIMETRY Pore size distribution (PSD) is a fundamental petrophysical parameter for shale formation evaluation. Nuclear magnetic resonance (NMR), performing as a widely acknowledged technique, directly measures transverse relaxation time (T2), which can be converted into PSD via surface relaxivity (SR). Technically, SR is utilized as a constant value in the entire formation, nevertheless, the laboratory calculated SRs revealed that they are likely to vary with mineralogy and can be influenced by Fe-bearing paramagnetic minerals, which could further affect NMR-converted pore structure properties. This study was performed on Permian Carynginia shale samples to compare the NMR-converted PSD with that measured by mercury injection capillary pressure (MICP). The surface relaxivity was calculated from the logarithmic mean T2 value (T2,lm) based on NMR measurement and the surface to volume ratio (SVR) based on low-pressure nitrogen gas adsorption (LP-N2-GA). The results show that Fe-bearing paramagnetic mineral contents are linear positively correlated with SR values, which were calculated to range between 0.08 and 0.32 μm/s in our tested samples. The paramagnetic mineral of higher content expedites the NMR T2 surface relaxation rate, leading to the divergent shifts in NMR- converted PSD curves. 2019 Journal Article http://hdl.handle.net/20.500.11937/89572 10.1021/acs.energyfuels.8b04003 English AMER CHEMICAL SOC restricted |
| spellingShingle | Science & Technology Technology Energy & Fuels Engineering, Chemical Engineering NUCLEAR-MAGNETIC-RESONANCE CLAY BOUND WATER SURFACE RELAXIVITY GAS-ADSORPTION POROSITY MEASUREMENT NITROGEN ADSORPTION FRACTAL ANALYSIS ORGANIC-MATTER AREA POROSIMETRY Yuan, Yujie Rezaee, Reza Impact of Paramagnetic Minerals on NMR-Converted Pore Size Distributions in Permian Carynginia Shales |
| title | Impact of Paramagnetic Minerals on NMR-Converted Pore Size Distributions in Permian Carynginia Shales |
| title_full | Impact of Paramagnetic Minerals on NMR-Converted Pore Size Distributions in Permian Carynginia Shales |
| title_fullStr | Impact of Paramagnetic Minerals on NMR-Converted Pore Size Distributions in Permian Carynginia Shales |
| title_full_unstemmed | Impact of Paramagnetic Minerals on NMR-Converted Pore Size Distributions in Permian Carynginia Shales |
| title_short | Impact of Paramagnetic Minerals on NMR-Converted Pore Size Distributions in Permian Carynginia Shales |
| title_sort | impact of paramagnetic minerals on nmr-converted pore size distributions in permian carynginia shales |
| topic | Science & Technology Technology Energy & Fuels Engineering, Chemical Engineering NUCLEAR-MAGNETIC-RESONANCE CLAY BOUND WATER SURFACE RELAXIVITY GAS-ADSORPTION POROSITY MEASUREMENT NITROGEN ADSORPTION FRACTAL ANALYSIS ORGANIC-MATTER AREA POROSIMETRY |
| url | http://hdl.handle.net/20.500.11937/89572 |