Comparative porosity and pore structure assessment in shales: Measurement techniques, influencing factors and implications for reservoir characterization
Porosity and pore size distribution (PSD) are essential petrophysical parameters controlling permeability and storage capacity in shale gas reservoirs. Various techniques to assess pore structure have been introduced; nevertheless, discrepancies and inconsistencies exist between each of them. This s...
| Main Authors: | , |
|---|---|
| Format: | Journal Article |
| Language: | English |
| Published: |
MDPI
2019
|
| Subjects: | |
| Online Access: | http://hdl.handle.net/20.500.11937/89583 |
| _version_ | 1848765252024401920 |
|---|---|
| author | Yuan, Yujie Rezaee, Reza |
| author_facet | Yuan, Yujie Rezaee, Reza |
| author_sort | Yuan, Yujie |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | Porosity and pore size distribution (PSD) are essential petrophysical parameters controlling permeability and storage capacity in shale gas reservoirs. Various techniques to assess pore structure have been introduced; nevertheless, discrepancies and inconsistencies exist between each of them. This study compares the porosity and PSD in two different shale formations, i.e., the clay-rich Permian Carynginia Formation in the Perth Basin, Western Australia, and the clay-poor Monterey Formation in San Joaquin Basin, USA. Porosity and PSD have been interpreted based on nuclear magnetic resonance (NMR), low-pressure N2 gas adsorption (LP-N2-GA), mercury intrusion capillary pressure (MICP) and helium expansion porosimetry. The results highlight NMR with the advantage of detecting the full-scaled size of pores that are not accessible by MICP, and the ineffective/closed pores occupied by clay bound water (CBW) that are not approachable by other penetration techniques (e.g., helium expansion, low-pressure gas adsorption and MICP). The NMR porosity is largely discrepant with the helium porosity and the MICP porosity in clay-rich Carynginia shales, but a high consistency is displayed in clay-poor Monterey shales, implying the impact of clay contents on the distinction of shale pore structure interpretations between different measurements. Further, the CBW, which is calculated by subtracting the measured effective porosity from total porosity, presents a good linear correlation with the clay content (R2 = 0.76), implying that our correlated equation is adaptable to estimate the CBW in shale formations with the dominant clay type of illite. |
| first_indexed | 2025-11-14T11:32:17Z |
| format | Journal Article |
| id | curtin-20.500.11937-89583 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-14T11:32:17Z |
| publishDate | 2019 |
| publisher | MDPI |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-895832022-11-14T05:36:32Z Comparative porosity and pore structure assessment in shales: Measurement techniques, influencing factors and implications for reservoir characterization Yuan, Yujie Rezaee, Reza Science & Technology Technology Energy & Fuels gas shale NMR helium porosimetry clay bound water porosity pore size distribution low-pressure gas adsorption MICP ANGLE NEUTRON-SCATTERING CLAY BOUND WATER GAS-ADSORPTION SIZE DISTRIBUTION SURFACE-AREA LOW-PRESSURE POROSIMETRY DISTRIBUTIONS COAL Porosity and pore size distribution (PSD) are essential petrophysical parameters controlling permeability and storage capacity in shale gas reservoirs. Various techniques to assess pore structure have been introduced; nevertheless, discrepancies and inconsistencies exist between each of them. This study compares the porosity and PSD in two different shale formations, i.e., the clay-rich Permian Carynginia Formation in the Perth Basin, Western Australia, and the clay-poor Monterey Formation in San Joaquin Basin, USA. Porosity and PSD have been interpreted based on nuclear magnetic resonance (NMR), low-pressure N2 gas adsorption (LP-N2-GA), mercury intrusion capillary pressure (MICP) and helium expansion porosimetry. The results highlight NMR with the advantage of detecting the full-scaled size of pores that are not accessible by MICP, and the ineffective/closed pores occupied by clay bound water (CBW) that are not approachable by other penetration techniques (e.g., helium expansion, low-pressure gas adsorption and MICP). The NMR porosity is largely discrepant with the helium porosity and the MICP porosity in clay-rich Carynginia shales, but a high consistency is displayed in clay-poor Monterey shales, implying the impact of clay contents on the distinction of shale pore structure interpretations between different measurements. Further, the CBW, which is calculated by subtracting the measured effective porosity from total porosity, presents a good linear correlation with the clay content (R2 = 0.76), implying that our correlated equation is adaptable to estimate the CBW in shale formations with the dominant clay type of illite. 2019 Journal Article http://hdl.handle.net/20.500.11937/89583 10.3390/en12112094 English http://creativecommons.org/licenses/by/4.0/ MDPI fulltext |
| spellingShingle | Science & Technology Technology Energy & Fuels gas shale NMR helium porosimetry clay bound water porosity pore size distribution low-pressure gas adsorption MICP ANGLE NEUTRON-SCATTERING CLAY BOUND WATER GAS-ADSORPTION SIZE DISTRIBUTION SURFACE-AREA LOW-PRESSURE POROSIMETRY DISTRIBUTIONS COAL Yuan, Yujie Rezaee, Reza Comparative porosity and pore structure assessment in shales: Measurement techniques, influencing factors and implications for reservoir characterization |
| title | Comparative porosity and pore structure assessment in shales: Measurement techniques, influencing factors and implications for reservoir characterization |
| title_full | Comparative porosity and pore structure assessment in shales: Measurement techniques, influencing factors and implications for reservoir characterization |
| title_fullStr | Comparative porosity and pore structure assessment in shales: Measurement techniques, influencing factors and implications for reservoir characterization |
| title_full_unstemmed | Comparative porosity and pore structure assessment in shales: Measurement techniques, influencing factors and implications for reservoir characterization |
| title_short | Comparative porosity and pore structure assessment in shales: Measurement techniques, influencing factors and implications for reservoir characterization |
| title_sort | comparative porosity and pore structure assessment in shales: measurement techniques, influencing factors and implications for reservoir characterization |
| topic | Science & Technology Technology Energy & Fuels gas shale NMR helium porosimetry clay bound water porosity pore size distribution low-pressure gas adsorption MICP ANGLE NEUTRON-SCATTERING CLAY BOUND WATER GAS-ADSORPTION SIZE DISTRIBUTION SURFACE-AREA LOW-PRESSURE POROSIMETRY DISTRIBUTIONS COAL |
| url | http://hdl.handle.net/20.500.11937/89583 |