An investigation of porosity-velocity relationships in faulted carbonates using outcrop analogues
Porosity and permeability are notoriously difficult to predict in carbonates, especially prior to drilling when there is a lack of direct petrophysical data. The aim of this paper is to document the initial results of an integrated outcrop and laboratory study designed to investigate the relationshi...
| Main Authors: | , , , , , |
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| Format: | Journal Article |
| Published: |
Geological Society of London
2015
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| Online Access: | http://hdl.handle.net/20.500.11937/43850 |
| _version_ | 1848756826890305536 |
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| author | Healy, D. Neilson, J. Haines, T. Michie, E. Timms, Nicholas Eric Wilson, M. |
| author_facet | Healy, D. Neilson, J. Haines, T. Michie, E. Timms, Nicholas Eric Wilson, M. |
| author_sort | Healy, D. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | Porosity and permeability are notoriously difficult to predict in carbonates, especially prior to drilling when there is a lack of direct petrophysical data. The aim of this paper is to document the initial results of an integrated outcrop and laboratory study designed to investigate the relationships between pore systems and acoustic velocities in faulted Oligo-Miocene carbonates on the Mediterranean islands of Malta and Gozo. Depositional facies is shown to have a significant effect, with velocities in grain-dominated carbonates up to 1000 m s−1 higher than those in micrite-dominated carbonates. Based on outcrop structural data, the fault zones can be separated into three architectural components: a fault core; an intensely damaged zone; and a weakly damaged zone, with the last passing into undamaged protolith. Our data suggest that only the fault core component can be identified using porosity–velocity data, with P-wave velocity (Vp) values of 5000–6500 m s−1 at helium porosities of less than 5%. Our study is novel in that the prediction of elastic properties and acoustic velocities across fault zones is anticipated by linking laboratory-scale measurements with seismic-scale predictions through quantitative rock physics modelling. |
| first_indexed | 2025-11-14T09:18:23Z |
| format | Journal Article |
| id | curtin-20.500.11937-43850 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T09:18:23Z |
| publishDate | 2015 |
| publisher | Geological Society of London |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-438502017-09-13T13:42:26Z An investigation of porosity-velocity relationships in faulted carbonates using outcrop analogues Healy, D. Neilson, J. Haines, T. Michie, E. Timms, Nicholas Eric Wilson, M. Porosity and permeability are notoriously difficult to predict in carbonates, especially prior to drilling when there is a lack of direct petrophysical data. The aim of this paper is to document the initial results of an integrated outcrop and laboratory study designed to investigate the relationships between pore systems and acoustic velocities in faulted Oligo-Miocene carbonates on the Mediterranean islands of Malta and Gozo. Depositional facies is shown to have a significant effect, with velocities in grain-dominated carbonates up to 1000 m s−1 higher than those in micrite-dominated carbonates. Based on outcrop structural data, the fault zones can be separated into three architectural components: a fault core; an intensely damaged zone; and a weakly damaged zone, with the last passing into undamaged protolith. Our data suggest that only the fault core component can be identified using porosity–velocity data, with P-wave velocity (Vp) values of 5000–6500 m s−1 at helium porosities of less than 5%. Our study is novel in that the prediction of elastic properties and acoustic velocities across fault zones is anticipated by linking laboratory-scale measurements with seismic-scale predictions through quantitative rock physics modelling. 2015 Journal Article http://hdl.handle.net/20.500.11937/43850 10.1144/SP406.13 Geological Society of London restricted |
| spellingShingle | Healy, D. Neilson, J. Haines, T. Michie, E. Timms, Nicholas Eric Wilson, M. An investigation of porosity-velocity relationships in faulted carbonates using outcrop analogues |
| title | An investigation of porosity-velocity relationships in faulted carbonates using outcrop analogues |
| title_full | An investigation of porosity-velocity relationships in faulted carbonates using outcrop analogues |
| title_fullStr | An investigation of porosity-velocity relationships in faulted carbonates using outcrop analogues |
| title_full_unstemmed | An investigation of porosity-velocity relationships in faulted carbonates using outcrop analogues |
| title_short | An investigation of porosity-velocity relationships in faulted carbonates using outcrop analogues |
| title_sort | investigation of porosity-velocity relationships in faulted carbonates using outcrop analogues |
| url | http://hdl.handle.net/20.500.11937/43850 |