Time-lapse sonic logs reveal patchy CO2 saturation in-situ
Based on time-lapse sonic and neutron porosity logs from the Nagaoka CO2 sequestration experiment, a P-wave velocity-saturation relation at reservoir depth is retrieved. It does not coincide with either of the end-member models of uniform and patchy saturation but falls in between even if realistic...
| Main Authors: | , , |
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| Format: | Journal Article |
| Published: |
American Geophysical Union
2011
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| Online Access: | http://hdl.handle.net/20.500.11937/21086 |
| _version_ | 1848750492337831936 |
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| author | Caspari, Eva Müller, T. Gurevich, Boris |
| author_facet | Caspari, Eva Müller, T. Gurevich, Boris |
| author_sort | Caspari, Eva |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | Based on time-lapse sonic and neutron porosity logs from the Nagaoka CO2 sequestration experiment, a P-wave velocity-saturation relation at reservoir depth is retrieved. It does not coincide with either of the end-member models of uniform and patchy saturation but falls in between even if realistic error estimates for the host rock properties are considered. Assuming a random distribution of CO2 patches it is shown that the mechanism of wave-induced flow can be evoked to explain this velocity-saturation relation. Characteristic CO2 patch size estimates range from 1 to 5 mm. Such mesoscopic heterogeneity can be responsible for attenuation and dispersion in the well logging frequency band. |
| first_indexed | 2025-11-14T07:37:41Z |
| format | Journal Article |
| id | curtin-20.500.11937-21086 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T07:37:41Z |
| publishDate | 2011 |
| publisher | American Geophysical Union |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-210862017-09-13T16:03:34Z Time-lapse sonic logs reveal patchy CO2 saturation in-situ Caspari, Eva Müller, T. Gurevich, Boris Based on time-lapse sonic and neutron porosity logs from the Nagaoka CO2 sequestration experiment, a P-wave velocity-saturation relation at reservoir depth is retrieved. It does not coincide with either of the end-member models of uniform and patchy saturation but falls in between even if realistic error estimates for the host rock properties are considered. Assuming a random distribution of CO2 patches it is shown that the mechanism of wave-induced flow can be evoked to explain this velocity-saturation relation. Characteristic CO2 patch size estimates range from 1 to 5 mm. Such mesoscopic heterogeneity can be responsible for attenuation and dispersion in the well logging frequency band. 2011 Journal Article http://hdl.handle.net/20.500.11937/21086 10.1029/2011GL046959 American Geophysical Union fulltext |
| spellingShingle | Caspari, Eva Müller, T. Gurevich, Boris Time-lapse sonic logs reveal patchy CO2 saturation in-situ |
| title | Time-lapse sonic logs reveal patchy CO2 saturation in-situ |
| title_full | Time-lapse sonic logs reveal patchy CO2 saturation in-situ |
| title_fullStr | Time-lapse sonic logs reveal patchy CO2 saturation in-situ |
| title_full_unstemmed | Time-lapse sonic logs reveal patchy CO2 saturation in-situ |
| title_short | Time-lapse sonic logs reveal patchy CO2 saturation in-situ |
| title_sort | time-lapse sonic logs reveal patchy co2 saturation in-situ |
| url | http://hdl.handle.net/20.500.11937/21086 |