Assessing pore quality impact on saturation exponent and water saturation calculation
Abstract The saturation exponent is one of the most important parameters needed to calculate water saturation in Archie’s equation. Generally, the saturation exponent is considered constant, but not all depth intervals have the same characteristics. This study aims to investigate the relationship be...
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| Format: | Article |
| Language: | English |
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SpringerOpen
2025-07-01
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| Series: | Journal of Petroleum Exploration and Production Technology |
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| Online Access: | https://doi.org/10.1007/s13202-025-02028-1 |
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| author | Suryo Prakoso Muhammad Burhannudinnur Firman Herdiansyah Sigit Rahmawan Billy Arioseno Prakoso |
| author_facet | Suryo Prakoso Muhammad Burhannudinnur Firman Herdiansyah Sigit Rahmawan Billy Arioseno Prakoso |
| author_sort | Suryo Prakoso |
| collection | DOAJ |
| description | Abstract The saturation exponent is one of the most important parameters needed to calculate water saturation in Archie’s equation. Generally, the saturation exponent is considered constant, but not all depth intervals have the same characteristics. This study aims to investigate the relationship between rock quality and the saturation exponent, a critical parameter in Archie’s equation for water saturation calculation. Given that rock texture and pore characteristics vary significantly with depth, assuming a constant saturation exponent can lead to inaccurate results. The study integrates core analysis and petrographic data to classify rock quality and its relationship with the saturation exponent. R t and R o data from core analysis are used to determine saturation exponent. Furthermore, rock quality is identified using the hydraulic flow unit concept by constructing log-log plots of reservoir quality index and pore volume to grain volume ratio. Several pore attribute parameters, such as the combination of shape factor and tortuosity (Kozeny’s constant), specific surface area, reservoir quality index, and clay volume, are examined for their influence on the saturation exponent. The saturation exponent shows strong correlation with Kozeny’s constant and clay volume. An empirical equation was developed to estimate the saturation exponent based on these parameters. Using this empirical equation, the saturation exponent can be estimated across depth intervals, leading to more accurate water saturation calculations. This study offers a practical method to estimate saturation exponent variation using readily available log-derived parameters. It contributes to more reliable determination of saturation exponent variation and enhances the accuracy of water saturation calculations in heterogeneous formations. |
| format | Article |
| id | doaj-art-5bdae6bb60754d65a96bc322af176af5 |
| institution | Kabale University |
| issn | 2190-0558 2190-0566 |
| language | English |
| publishDate | 2025-07-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Journal of Petroleum Exploration and Production Technology |
| spelling | doaj-art-5bdae6bb60754d65a96bc322af176af52025-08-20T03:45:47ZengSpringerOpenJournal of Petroleum Exploration and Production Technology2190-05582190-05662025-07-0115811510.1007/s13202-025-02028-1Assessing pore quality impact on saturation exponent and water saturation calculationSuryo Prakoso0Muhammad Burhannudinnur1Firman Herdiansyah2Sigit Rahmawan3Billy Arioseno Prakoso4Petroleum Engineering, Faculty of Earth and Energy Technology, Universitas TrisaktiGeological Engineering, Faculty of Earth and Energy Technology, Universitas TrisaktiGeological Engineering, Faculty of Earth and Energy Technology, Universitas TrisaktiPetroleum Engineering, Faculty of Earth and Energy Technology, Universitas TrisaktiPetroleum Engineering, Faculty of Earth and Energy Technology, Universitas TrisaktiAbstract The saturation exponent is one of the most important parameters needed to calculate water saturation in Archie’s equation. Generally, the saturation exponent is considered constant, but not all depth intervals have the same characteristics. This study aims to investigate the relationship between rock quality and the saturation exponent, a critical parameter in Archie’s equation for water saturation calculation. Given that rock texture and pore characteristics vary significantly with depth, assuming a constant saturation exponent can lead to inaccurate results. The study integrates core analysis and petrographic data to classify rock quality and its relationship with the saturation exponent. R t and R o data from core analysis are used to determine saturation exponent. Furthermore, rock quality is identified using the hydraulic flow unit concept by constructing log-log plots of reservoir quality index and pore volume to grain volume ratio. Several pore attribute parameters, such as the combination of shape factor and tortuosity (Kozeny’s constant), specific surface area, reservoir quality index, and clay volume, are examined for their influence on the saturation exponent. The saturation exponent shows strong correlation with Kozeny’s constant and clay volume. An empirical equation was developed to estimate the saturation exponent based on these parameters. Using this empirical equation, the saturation exponent can be estimated across depth intervals, leading to more accurate water saturation calculations. This study offers a practical method to estimate saturation exponent variation using readily available log-derived parameters. It contributes to more reliable determination of saturation exponent variation and enhances the accuracy of water saturation calculations in heterogeneous formations.https://doi.org/10.1007/s13202-025-02028-1Konzeny constantSaturation exponentShape factorTortuosityReservoir quality index |
| spellingShingle | Suryo Prakoso Muhammad Burhannudinnur Firman Herdiansyah Sigit Rahmawan Billy Arioseno Prakoso Assessing pore quality impact on saturation exponent and water saturation calculation Journal of Petroleum Exploration and Production Technology Konzeny constant Saturation exponent Shape factor Tortuosity Reservoir quality index |
| title | Assessing pore quality impact on saturation exponent and water saturation calculation |
| title_full | Assessing pore quality impact on saturation exponent and water saturation calculation |
| title_fullStr | Assessing pore quality impact on saturation exponent and water saturation calculation |
| title_full_unstemmed | Assessing pore quality impact on saturation exponent and water saturation calculation |
| title_short | Assessing pore quality impact on saturation exponent and water saturation calculation |
| title_sort | assessing pore quality impact on saturation exponent and water saturation calculation |
| topic | Konzeny constant Saturation exponent Shape factor Tortuosity Reservoir quality index |
| url | https://doi.org/10.1007/s13202-025-02028-1 |
| work_keys_str_mv | AT suryoprakoso assessingporequalityimpactonsaturationexponentandwatersaturationcalculation AT muhammadburhannudinnur assessingporequalityimpactonsaturationexponentandwatersaturationcalculation AT firmanherdiansyah assessingporequalityimpactonsaturationexponentandwatersaturationcalculation AT sigitrahmawan assessingporequalityimpactonsaturationexponentandwatersaturationcalculation AT billyariosenoprakoso assessingporequalityimpactonsaturationexponentandwatersaturationcalculation |