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Analysis of effect of using estimated shear wave data as compared to measured compressional and shear wave sonic log
Includes abstract.
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| Format: | Thesis |
| Language: | English |
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Department of Geological Sciences
2014
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| _version_ | 1867613150461820928 |
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| access_status_str | Open Access |
| author | Oghenekohwo, Felix Onovughe |
| author2 | Smith, George |
| author_browse | Oghenekohwo, Felix Onovughe Smith, George |
| author_facet | Smith, George Oghenekohwo, Felix Onovughe |
| author_sort | Oghenekohwo, Felix Onovughe |
| collection | Thesis |
| description | Includes abstract. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/4216 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:31:34.243Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository |
| publishDate | 2014 |
| publishDateRange | 2014 |
| publishDateSort | 2014 |
| 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:11427/4216 Analysis of effect of using estimated shear wave data as compared to measured compressional and shear wave sonic log Oghenekohwo, Felix Onovughe Smith, George Geological Sciences Includes abstract. Includes bibliographical references (leaves 93-97). This study is aimed at developing a workflow, and ultimately a model, for quantitative interpretation of sonic and seismic data. Measured data collected at the point of logging can be fraught with errors that can lead to wrong interpretation. One of such data is the shear wave velocity which in most cases is collected with the compressional wave velocity. The measured shear wave velocity log may contain errors that are due to drilling conditions, mud invasion etc. It may also contain cycle skips and might contain a lot of missing data and information. It is because of the poor quality of this type of log that has often made well log analysis companies and log interpreters neglect the measured shear wave log and subsequently generate or create an estimated shear wave log which they use for interpretation and modelling to check how the amplitudes vary with increasing offsets, among other uses.The workflow presented in this study considers the effect of working with the measured data, a reprocessed shear wave log and a locally estimated shear wave log. Specific correction procedures for invasion of the logs was done and synthetic seismograms were created for each type after correction for comparison to a 3D seismic data. The results of this study suggest that oil based mud invasion can cause significant problems to sonic logs especially the shear wave log. It also suggests that, if a shear wave log is of low or bad quality, a reprocessed shear wave log would be better for interpretation and modeling rather than a locally calibrated shear wave log or an estimated shear wave log using global predictions. The conclusion is evident from the synthetics generated using the measured shear wave data and the estimated shear wave data. 2014-07-30T17:27:34Z 2014-07-30T17:27:34Z 2010 Master Thesis Masters MSc http://hdl.handle.net/11427/4216 eng application/pdf Department of Geological Sciences Faculty of Science University of Cape Town |
| spellingShingle | Geological Sciences Oghenekohwo, Felix Onovughe Analysis of effect of using estimated shear wave data as compared to measured compressional and shear wave sonic log |
| thesis_degree_str | Master's |
| title | Analysis of effect of using estimated shear wave data as compared to measured compressional and shear wave sonic log |
| title_full | Analysis of effect of using estimated shear wave data as compared to measured compressional and shear wave sonic log |
| title_fullStr | Analysis of effect of using estimated shear wave data as compared to measured compressional and shear wave sonic log |
| title_full_unstemmed | Analysis of effect of using estimated shear wave data as compared to measured compressional and shear wave sonic log |
| title_short | Analysis of effect of using estimated shear wave data as compared to measured compressional and shear wave sonic log |
| title_sort | analysis of effect of using estimated shear wave data as compared to measured compressional and shear wave sonic log |
| topic | Geological Sciences |
| url | http://hdl.handle.net/11427/4216 |
| work_keys_str_mv | AT oghenekohwofelixonovughe analysisofeffectofusingestimatedshearwavedataascomparedtomeasuredcompressionalandshearwavesoniclog |