Reservoir and lithofacies shale classification based on NMR logging
Shale gas reservoirs have fine-grained textures and high organic contents, leading to complex pore structures. Therefore, accurate well-log derived pore size distributions are difficult to acquire for this unconventional reservoir type, despite their importance. However, nuclear magnetic resonance (...
| Main Authors: | , , , , , , , |
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| Format: | Journal Article |
| Published: |
2020
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| Online Access: | http://hdl.handle.net/20.500.11937/89558 |
| _version_ | 1848765245104848896 |
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| author | Yu, H. Wang, Z. Wen, F. Rezaee, Reza Lebedev, Maxim Li, X. Zhang, Y. Iglauer, Stefan |
| author_facet | Yu, H. Wang, Z. Wen, F. Rezaee, Reza Lebedev, Maxim Li, X. Zhang, Y. Iglauer, Stefan |
| author_sort | Yu, H. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | Shale gas reservoirs have fine-grained textures and high organic contents, leading to complex pore structures. Therefore, accurate well-log derived pore size distributions are difficult to acquire for this unconventional reservoir type, despite their importance. However, nuclear magnetic resonance (NMR) logging can in principle provide such information via hydrogen relaxation time measurements. Thus, in this paper, NMR response curves (of shale samples) were rigorously mathematically analyzed (with an Expectation Maximization algorithm) and categorized based on the NMR data and their geology, respectively. Thus the number of the NMR peaks, their relaxation times and amplitudes were analyzed to characterize pore size distributions and lithofacies. Seven pore size distribution classes were distinguished; these were verified independently with Pulsed-Neutron Spectrometry (PNS) well-log data. This study thus improves the interpretation of well log data in terms of pore structure and mineralogy of shale reservoirs, and consequently aids in the optimization of shale gas extraction from the subsurface. |
| first_indexed | 2025-11-14T11:32:11Z |
| format | Journal Article |
| id | curtin-20.500.11937-89558 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T11:32:11Z |
| publishDate | 2020 |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-895582023-01-12T08:13:53Z Reservoir and lithofacies shale classification based on NMR logging Yu, H. Wang, Z. Wen, F. Rezaee, Reza Lebedev, Maxim Li, X. Zhang, Y. Iglauer, Stefan Shale gas reservoirs have fine-grained textures and high organic contents, leading to complex pore structures. Therefore, accurate well-log derived pore size distributions are difficult to acquire for this unconventional reservoir type, despite their importance. However, nuclear magnetic resonance (NMR) logging can in principle provide such information via hydrogen relaxation time measurements. Thus, in this paper, NMR response curves (of shale samples) were rigorously mathematically analyzed (with an Expectation Maximization algorithm) and categorized based on the NMR data and their geology, respectively. Thus the number of the NMR peaks, their relaxation times and amplitudes were analyzed to characterize pore size distributions and lithofacies. Seven pore size distribution classes were distinguished; these were verified independently with Pulsed-Neutron Spectrometry (PNS) well-log data. This study thus improves the interpretation of well log data in terms of pore structure and mineralogy of shale reservoirs, and consequently aids in the optimization of shale gas extraction from the subsurface. 2020 Journal Article http://hdl.handle.net/20.500.11937/89558 10.1016/j.ptlrs.2020.04.005 http://creativecommons.org/licenses/by-nc-nd/4.0/ fulltext |
| spellingShingle | Yu, H. Wang, Z. Wen, F. Rezaee, Reza Lebedev, Maxim Li, X. Zhang, Y. Iglauer, Stefan Reservoir and lithofacies shale classification based on NMR logging |
| title | Reservoir and lithofacies shale classification based on NMR logging |
| title_full | Reservoir and lithofacies shale classification based on NMR logging |
| title_fullStr | Reservoir and lithofacies shale classification based on NMR logging |
| title_full_unstemmed | Reservoir and lithofacies shale classification based on NMR logging |
| title_short | Reservoir and lithofacies shale classification based on NMR logging |
| title_sort | reservoir and lithofacies shale classification based on nmr logging |
| url | http://hdl.handle.net/20.500.11937/89558 |