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Pressure effects on the joint elastic-electrical properties of reservoir sandstones

Pressure effects on the joint elastic-electrical properties of reservoir sandstones
Pressure effects on the joint elastic-electrical properties of reservoir sandstones
We conducted a laboratory study of the joint elastic-electrical properties of sixty-three brine-saturated sandstone samples to assess the likely impact of differential pressure (confining minus pore fluid pressures) in the range 8–60 MPa on the joint interpretation of marine seismic and controlled-source electromagnetic survey data. The samples showed a wide range of petrophysical properties representative of most sandstone reservoirs. We found that a regression equation comprising both a constant and an exponential part gave a good fit to the pressure dependence of all five measured geophysical parameters (ultrasonic P- and S-wave velocity, attenuation and electrical resistivity). Electrical resistivity was more pressure-sensitive in clay-rich sandstones with higher concentrations of low aspect ratio pores and micropores than in clean sandstones. Attenuation was more pressure-sensitive in clean sandstones with large open pores (macropores) than in clay-rich sandstones. Pore shape did not show any influence on the pressure sensitivity of elastic velocity. As differential pressure increases, the effect of the low aspect ratio pores and micropores on electrical resistivity becomes stronger than the effect of the macropores on attenuation. Further analysis of correlations among the five parameters as a function of pressure revealed potentially diagnostic relationships for geopressure prediction in reservoir sandstones.
Joint elastic-electrical properties, Pressure effects, Reservoir sandstones
0016-8025
506-517
Han, Tongcheng
252052d9-a0e6-454d-b02e-d11fbd3dd8d8
Best, Angus I.
cad03726-10f8-4f90-a3ba-5031665234c9
Sothcott, Jeremy
71ab4088-7b13-46d6-9e28-67538a02d595
MacGregor, Lucy M.
ef8f3112-33b2-4e64-853b-ee72936c4155
Han, Tongcheng
252052d9-a0e6-454d-b02e-d11fbd3dd8d8
Best, Angus I.
cad03726-10f8-4f90-a3ba-5031665234c9
Sothcott, Jeremy
71ab4088-7b13-46d6-9e28-67538a02d595
MacGregor, Lucy M.
ef8f3112-33b2-4e64-853b-ee72936c4155

Han, Tongcheng, Best, Angus I., Sothcott, Jeremy and MacGregor, Lucy M. (2011) Pressure effects on the joint elastic-electrical properties of reservoir sandstones. Geophysical Prospecting, 59 (3), 506-517. (doi:10.1111/j.1365-2478.2010.00939.x).

Record type: Article

Abstract

We conducted a laboratory study of the joint elastic-electrical properties of sixty-three brine-saturated sandstone samples to assess the likely impact of differential pressure (confining minus pore fluid pressures) in the range 8–60 MPa on the joint interpretation of marine seismic and controlled-source electromagnetic survey data. The samples showed a wide range of petrophysical properties representative of most sandstone reservoirs. We found that a regression equation comprising both a constant and an exponential part gave a good fit to the pressure dependence of all five measured geophysical parameters (ultrasonic P- and S-wave velocity, attenuation and electrical resistivity). Electrical resistivity was more pressure-sensitive in clay-rich sandstones with higher concentrations of low aspect ratio pores and micropores than in clean sandstones. Attenuation was more pressure-sensitive in clean sandstones with large open pores (macropores) than in clay-rich sandstones. Pore shape did not show any influence on the pressure sensitivity of elastic velocity. As differential pressure increases, the effect of the low aspect ratio pores and micropores on electrical resistivity becomes stronger than the effect of the macropores on attenuation. Further analysis of correlations among the five parameters as a function of pressure revealed potentially diagnostic relationships for geopressure prediction in reservoir sandstones.

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More information

Published date: May 2011
Keywords: Joint elastic-electrical properties, Pressure effects, Reservoir sandstones
Organisations: Marine Geoscience

Identifiers

Local EPrints ID: 183231
URI: http://eprints.soton.ac.uk/id/eprint/183231
ISSN: 0016-8025
PURE UUID: dcf1ebd6-a5f6-440f-b918-0c43b11719b4

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Date deposited: 27 Apr 2011 13:34
Last modified: 08 Nov 2021 19:09

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Contributors

Author: Tongcheng Han
Author: Angus I. Best
Author: Jeremy Sothcott
Author: Lucy M. MacGregor

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