Investigation of core data reliability to support time-lapse interpretation in Campos Basin, Brazil
A comparison between laboratory experiments and log measurements was done to investigate the effect of core damage on compressional wave velocities. This was done using 43 rock samples extracted from a 45 meters thick turbidite reservoir. We used Gassmann fluid substitution to obtain low-frequency s...
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| Other Authors: | |
| Format: | Conference Paper |
| Published: |
Society of Exploration Geophysics
2007
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| Online Access: | http://hdl.handle.net/20.500.11937/25608 |
| _version_ | 1848751756574457856 |
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| author | Grochau, Marcos Gurevich, Boris |
| author2 | SEG |
| author_facet | SEG Grochau, Marcos Gurevich, Boris |
| author_sort | Grochau, Marcos |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | A comparison between laboratory experiments and log measurements was done to investigate the effect of core damage on compressional wave velocities. This was done using 43 rock samples extracted from a 45 meters thick turbidite reservoir. We used Gassmann fluid substitution to obtain low-frequency saturated velocities from dry core measurements (thus mitigating the dispersion effects) taken at reservoir pressure. To mitigate the scale effect (or under-representation of reservoir properties by a number of small cores), we apply a correction for small mismatch between the core and log porosities. Comparison of these computed velocities with the sonic log measurements shows very good agreement. This confirms that for this particular portion of the reservoir the effect of core damage on ultrasonic measurements is below the measurement error. The results suggest that stress sensitivity of elastic properties as obtained from ultrasonic measurements is adequate for quantitative interpretation of time-lapse seismic data. |
| first_indexed | 2025-11-14T07:57:47Z |
| format | Conference Paper |
| id | curtin-20.500.11937-25608 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T07:57:47Z |
| publishDate | 2007 |
| publisher | Society of Exploration Geophysics |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-256082017-09-13T15:52:04Z Investigation of core data reliability to support time-lapse interpretation in Campos Basin, Brazil Grochau, Marcos Gurevich, Boris SEG A comparison between laboratory experiments and log measurements was done to investigate the effect of core damage on compressional wave velocities. This was done using 43 rock samples extracted from a 45 meters thick turbidite reservoir. We used Gassmann fluid substitution to obtain low-frequency saturated velocities from dry core measurements (thus mitigating the dispersion effects) taken at reservoir pressure. To mitigate the scale effect (or under-representation of reservoir properties by a number of small cores), we apply a correction for small mismatch between the core and log porosities. Comparison of these computed velocities with the sonic log measurements shows very good agreement. This confirms that for this particular portion of the reservoir the effect of core damage on ultrasonic measurements is below the measurement error. The results suggest that stress sensitivity of elastic properties as obtained from ultrasonic measurements is adequate for quantitative interpretation of time-lapse seismic data. 2007 Conference Paper http://hdl.handle.net/20.500.11937/25608 10.1190/1.2793088 Society of Exploration Geophysics fulltext |
| spellingShingle | Grochau, Marcos Gurevich, Boris Investigation of core data reliability to support time-lapse interpretation in Campos Basin, Brazil |
| title | Investigation of core data reliability to support time-lapse interpretation in Campos Basin, Brazil |
| title_full | Investigation of core data reliability to support time-lapse interpretation in Campos Basin, Brazil |
| title_fullStr | Investigation of core data reliability to support time-lapse interpretation in Campos Basin, Brazil |
| title_full_unstemmed | Investigation of core data reliability to support time-lapse interpretation in Campos Basin, Brazil |
| title_short | Investigation of core data reliability to support time-lapse interpretation in Campos Basin, Brazil |
| title_sort | investigation of core data reliability to support time-lapse interpretation in campos basin, brazil |
| url | http://hdl.handle.net/20.500.11937/25608 |