Inversion Method of Formation Water Salinity in Hydrocarbon-Bearing Sandstone Based on Spontaneous Potential
The formation water salinity is an important reservoir parameter, which is also the basis for reservoir fine evaluation. When the reservoir contains hydrocarbons, the abnormal amplitude of the spontaneous potential curve decreases, which affects the accuracy of inverting the formation water salinity...
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| Format: | Article |
| Language: | zho |
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Editorial Office of Well Logging Technology
2024-08-01
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| Series: | Cejing jishu |
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| Online Access: | https://www.cnpcwlt.com/#/digest?ArticleID=5623 |
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| author | ZHANG Jiansheng LU Yunlong QI Yi KANG Nan |
| author_facet | ZHANG Jiansheng LU Yunlong QI Yi KANG Nan |
| author_sort | ZHANG Jiansheng |
| collection | DOAJ |
| description | The formation water salinity is an important reservoir parameter, which is also the basis for reservoir fine evaluation. When the reservoir contains hydrocarbons, the abnormal amplitude of the spontaneous potential curve decreases, which affects the accuracy of inverting the formation water salinity. Based on experimental data from publicly published articles, the relationship between water saturation, formation water salinity, mud filtrate salinity, and spontaneous potential reduction in pure sandstone reservoirs is quantitatively characterized. This relationship is combined with a saturation model to construct an inversion model for water salinity in hydrocarbon bearing sandstone reservoirs based on spontaneous potential curves. The inversion model is applied in the target well and an experiment of measuring bound water salinity is carried out to verify the inverse method. It shows that the inversion results are basically consistent with the experimental results. The method accurately characterizes the suppression effect of hydrocarbons on the spontaneous potential curve, and can accurately calculate the formation water salinity, providing a basis for fluid identification and reservoir evaluation. |
| format | Article |
| id | doaj-art-1079381fdeb849de9c8b8cae8a440eb9 |
| institution | OA Journals |
| issn | 1004-1338 |
| language | zho |
| publishDate | 2024-08-01 |
| publisher | Editorial Office of Well Logging Technology |
| record_format | Article |
| series | Cejing jishu |
| spelling | doaj-art-1079381fdeb849de9c8b8cae8a440eb92025-08-20T01:55:26ZzhoEditorial Office of Well Logging TechnologyCejing jishu1004-13382024-08-0148450050810.16489/j.issn.1004-1338.2024.04.0101004-1338(2024)04-0500-09Inversion Method of Formation Water Salinity in Hydrocarbon-Bearing Sandstone Based on Spontaneous PotentialZHANG Jiansheng0LU Yunlong1QI Yi2KANG Nan3Tianjin Branch, CNOOC China Limited, Tianjin 300459, ChinaTianjin Branch, CNOOC China Limited, Tianjin 300459, ChinaTianjin Branch, CNOOC China Limited, Tianjin 300459, ChinaBranch of Engineering Technology, CNOOC Energy Technology & Services Limited, Tianjin 300452, ChinaThe formation water salinity is an important reservoir parameter, which is also the basis for reservoir fine evaluation. When the reservoir contains hydrocarbons, the abnormal amplitude of the spontaneous potential curve decreases, which affects the accuracy of inverting the formation water salinity. Based on experimental data from publicly published articles, the relationship between water saturation, formation water salinity, mud filtrate salinity, and spontaneous potential reduction in pure sandstone reservoirs is quantitatively characterized. This relationship is combined with a saturation model to construct an inversion model for water salinity in hydrocarbon bearing sandstone reservoirs based on spontaneous potential curves. The inversion model is applied in the target well and an experiment of measuring bound water salinity is carried out to verify the inverse method. It shows that the inversion results are basically consistent with the experimental results. The method accurately characterizes the suppression effect of hydrocarbons on the spontaneous potential curve, and can accurately calculate the formation water salinity, providing a basis for fluid identification and reservoir evaluation.https://www.cnpcwlt.com/#/digest?ArticleID=5623spontaneous potentialhydrocarbon-bearing sandstoneformation water salinitybound water salinitywater saturationinversion |
| spellingShingle | ZHANG Jiansheng LU Yunlong QI Yi KANG Nan Inversion Method of Formation Water Salinity in Hydrocarbon-Bearing Sandstone Based on Spontaneous Potential Cejing jishu spontaneous potential hydrocarbon-bearing sandstone formation water salinity bound water salinity water saturation inversion |
| title | Inversion Method of Formation Water Salinity in Hydrocarbon-Bearing Sandstone Based on Spontaneous Potential |
| title_full | Inversion Method of Formation Water Salinity in Hydrocarbon-Bearing Sandstone Based on Spontaneous Potential |
| title_fullStr | Inversion Method of Formation Water Salinity in Hydrocarbon-Bearing Sandstone Based on Spontaneous Potential |
| title_full_unstemmed | Inversion Method of Formation Water Salinity in Hydrocarbon-Bearing Sandstone Based on Spontaneous Potential |
| title_short | Inversion Method of Formation Water Salinity in Hydrocarbon-Bearing Sandstone Based on Spontaneous Potential |
| title_sort | inversion method of formation water salinity in hydrocarbon bearing sandstone based on spontaneous potential |
| topic | spontaneous potential hydrocarbon-bearing sandstone formation water salinity bound water salinity water saturation inversion |
| url | https://www.cnpcwlt.com/#/digest?ArticleID=5623 |
| work_keys_str_mv | AT zhangjiansheng inversionmethodofformationwatersalinityinhydrocarbonbearingsandstonebasedonspontaneouspotential AT luyunlong inversionmethodofformationwatersalinityinhydrocarbonbearingsandstonebasedonspontaneouspotential AT qiyi inversionmethodofformationwatersalinityinhydrocarbonbearingsandstonebasedonspontaneouspotential AT kangnan inversionmethodofformationwatersalinityinhydrocarbonbearingsandstonebasedonspontaneouspotential |