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4D seismic analysis: discriminating between saturation and pressure changes form a data acquired Offshore Equatorial Guinea
4D seismic analysis is used to understand the performance of a producing oil field in order to increase production and mitigate risk. This is done by interpreting changes in water saturation and changes in effective pressure in the reservoir, which allows production to be maximized safely. In this p...
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| Format: | Thesis |
| Language: | English |
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Department of Geological Sciences
2017
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| _version_ | 1867613291094736896 |
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| access_status_str | Open Access |
| author | Msolo, Andile Lucky |
| author2 | Kahle, Beth |
| author_browse | Kahle, Beth Msolo, Andile Lucky |
| author_facet | Kahle, Beth Msolo, Andile Lucky |
| author_sort | Msolo, Andile Lucky |
| collection | Thesis |
| description | 4D seismic analysis is used to understand the performance of a producing oil field in order to increase production and mitigate risk. This is done by interpreting changes in water saturation and changes in effective pressure in the reservoir, which allows production to be maximized safely. In this project, I determined saturation and pressure changes in an oil field offshore Equatorial Guinea. I used Landrø's technique as a basis for the analysis, however Landrø's technique requires the presence of reservoir samples. For this project, rock samples of the reservoir were not available; this led me to modify Landrø's methodology using approximations based on well-accepted rock physics relationships. I tested this new methodology on a synthetic model, which gave encouraging results, after which it was applied to real seismic data. Pressure and saturation changes estimated in the reservoir indicate that the northern part of the reservoir experienced a decrease in pore pressure. The saturation changes over the northern part of the reservoir are not prominent. The central and southern parts of the reservoir show an increase in water saturation accompanied by an increase in pore pressure. The results are consistent with the production and injection history of this area. A comparison between saturation before production, saturation changes after production and pressure changes after production indicates an area (on the northern part of the reservoir) which shows fluid anomalies before production and does not show any production (or 4D) effects. New production wells could potentially be drilled in this area to increase production. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/25501 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:33:48.261Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository |
| publishDate | 2017 |
| publishDateRange | 2017 |
| publishDateSort | 2017 |
| publisher | Department of Geological Sciences |
| publisherStr | Department of Geological Sciences |
| record_format | dspace |
| source_str | UCTD — University of Cape Town Open Access Repository |
| spelling | oai:open.uct.ac.za:11427/25501 4D seismic analysis: discriminating between saturation and pressure changes form a data acquired Offshore Equatorial Guinea Msolo, Andile Lucky Kahle, Beth Gidlow, Maurice Kahle, Richard Geology 4D seismic analysis is used to understand the performance of a producing oil field in order to increase production and mitigate risk. This is done by interpreting changes in water saturation and changes in effective pressure in the reservoir, which allows production to be maximized safely. In this project, I determined saturation and pressure changes in an oil field offshore Equatorial Guinea. I used Landrø's technique as a basis for the analysis, however Landrø's technique requires the presence of reservoir samples. For this project, rock samples of the reservoir were not available; this led me to modify Landrø's methodology using approximations based on well-accepted rock physics relationships. I tested this new methodology on a synthetic model, which gave encouraging results, after which it was applied to real seismic data. Pressure and saturation changes estimated in the reservoir indicate that the northern part of the reservoir experienced a decrease in pore pressure. The saturation changes over the northern part of the reservoir are not prominent. The central and southern parts of the reservoir show an increase in water saturation accompanied by an increase in pore pressure. The results are consistent with the production and injection history of this area. A comparison between saturation before production, saturation changes after production and pressure changes after production indicates an area (on the northern part of the reservoir) which shows fluid anomalies before production and does not show any production (or 4D) effects. New production wells could potentially be drilled in this area to increase production. 2017-10-03T14:16:21Z 2017-10-03T14:16:21Z 2017 Master Thesis Masters MSc http://hdl.handle.net/11427/25501 eng application/pdf Department of Geological Sciences Faculty of Science University of Cape Town |
| spellingShingle | Geology Msolo, Andile Lucky 4D seismic analysis: discriminating between saturation and pressure changes form a data acquired Offshore Equatorial Guinea |
| thesis_degree_str | Master's |
| title | 4D seismic analysis: discriminating between saturation and pressure changes form a data acquired Offshore Equatorial Guinea |
| title_full | 4D seismic analysis: discriminating between saturation and pressure changes form a data acquired Offshore Equatorial Guinea |
| title_fullStr | 4D seismic analysis: discriminating between saturation and pressure changes form a data acquired Offshore Equatorial Guinea |
| title_full_unstemmed | 4D seismic analysis: discriminating between saturation and pressure changes form a data acquired Offshore Equatorial Guinea |
| title_short | 4D seismic analysis: discriminating between saturation and pressure changes form a data acquired Offshore Equatorial Guinea |
| title_sort | 4d seismic analysis discriminating between saturation and pressure changes form a data acquired offshore equatorial guinea |
| topic | Geology |
| url | http://hdl.handle.net/11427/25501 |
| work_keys_str_mv | AT msoloandilelucky 4dseismicanalysisdiscriminatingbetweensaturationandpressurechangesformadataacquiredoffshoreequatorialguinea |