Fluid substitution in shaley sediment using effective porosity
The traditional method of fluid substitution in porous rock requires the total porosity and the elastic modulus of the mineral phase as input and assumes that the fluid reaches instantaneous hydraulic equilibrium throughout the pore space. This assumption may not be appropriate for shaley sediment b...
| Main Authors: | , , |
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| Format: | Journal Article |
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Society of Exploration Geophysics
2007
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| Online Access: | http://hdl.handle.net/20.500.11937/14723 |
| _version_ | 1848748699655602176 |
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| author | Dvorkin, J. Mavko, G. Gurevich, Boris |
| author_facet | Dvorkin, J. Mavko, G. Gurevich, Boris |
| author_sort | Dvorkin, J. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | The traditional method of fluid substitution in porous rock requires the total porosity and the elastic modulus of the mineral phase as input and assumes that the fluid reaches instantaneous hydraulic equilibrium throughout the pore space. This assumption may not be appropriate for shaley sediment because of the low permeability of shale and the resulting immobility of the water in it. To address this problem, we propose an alternative method that uses effective porosity instead of total porosity. Effective porosity is lower than total porosity if porous shale is present in the system. A new, composite mineral phase is introduced, which includes the porous water-saturated shale together with the nonporous minerals and whose elastic modulus is an average of those of its components, including the porous shale. This alternative method increases the sensitivity of the elastic properties of sediment-to-pore-fluid changes and therefore may be used as a physics-based theoretical tool to better explain and interpret seismic data during exploration as well as variations in seismic response as hydrocarbon production progresses. |
| first_indexed | 2025-11-14T07:09:12Z |
| format | Journal Article |
| id | curtin-20.500.11937-14723 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T07:09:12Z |
| publishDate | 2007 |
| publisher | Society of Exploration Geophysics |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-147232017-09-13T15:52:27Z Fluid substitution in shaley sediment using effective porosity Dvorkin, J. Mavko, G. Gurevich, Boris The traditional method of fluid substitution in porous rock requires the total porosity and the elastic modulus of the mineral phase as input and assumes that the fluid reaches instantaneous hydraulic equilibrium throughout the pore space. This assumption may not be appropriate for shaley sediment because of the low permeability of shale and the resulting immobility of the water in it. To address this problem, we propose an alternative method that uses effective porosity instead of total porosity. Effective porosity is lower than total porosity if porous shale is present in the system. A new, composite mineral phase is introduced, which includes the porous water-saturated shale together with the nonporous minerals and whose elastic modulus is an average of those of its components, including the porous shale. This alternative method increases the sensitivity of the elastic properties of sediment-to-pore-fluid changes and therefore may be used as a physics-based theoretical tool to better explain and interpret seismic data during exploration as well as variations in seismic response as hydrocarbon production progresses. 2007 Journal Article http://hdl.handle.net/20.500.11937/14723 10.1190/1.2565256 Society of Exploration Geophysics fulltext |
| spellingShingle | Dvorkin, J. Mavko, G. Gurevich, Boris Fluid substitution in shaley sediment using effective porosity |
| title | Fluid substitution in shaley sediment using effective porosity |
| title_full | Fluid substitution in shaley sediment using effective porosity |
| title_fullStr | Fluid substitution in shaley sediment using effective porosity |
| title_full_unstemmed | Fluid substitution in shaley sediment using effective porosity |
| title_short | Fluid substitution in shaley sediment using effective porosity |
| title_sort | fluid substitution in shaley sediment using effective porosity |
| url | http://hdl.handle.net/20.500.11937/14723 |