Pressure-varying CO2 distribution affects the ultrasonic velocities of synthetic sandstones
Pressure-varying CO2 distribution affects the ultrasonic velocities of synthetic sandstones
We performed a novel experiment in which three synthetic sandstones – manufactured using a common method but having different porosities – were saturated with brine and progressively flooded with CO2 under constant confining pressure. The fluid pressure was varied around the critical pressure of CO2 and repeated measurements were made of resistivity, in order to assess the saturation, and elastic wave velocity during the flood. The measured saturated bulk moduli were higher than those predicted by the Gassmann–Wood theory, but were consistent with behaviour described by a recently derived poroelastic model which combines “patch” and “squirt” effects. Measurements on two of the samples followed a patch-based model while those on the highest porosity sample showed evidence of squirt-flow behaviour. Our analysis suggests that the appropriate fluid mixing law is pressure dependent, which is consistent with the notion that the effective patch size decreases as fluid pressure is increased. We derive simple empirical models for the patch dependence from fluid pressure which may be used in seismic modelling and interpretation exercises relevant to monitoring of CO2 injection.
1-8
Papageorgiou, Giorgos
8181cca9-12a0-4fa6-93a3-d5711132bc87
Falcon-suarez, Ismael
9e8022b5-8799-4326-8d5b-0ed46de3b25a
Chapman, Mark
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Best, Angus
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July 2018
Papageorgiou, Giorgos
8181cca9-12a0-4fa6-93a3-d5711132bc87
Falcon-suarez, Ismael
9e8022b5-8799-4326-8d5b-0ed46de3b25a
Chapman, Mark
6f13eb72-ad0e-4c7a-b60c-92387a707cf4
Best, Angus
fd094b23-2f48-41d3-a725-fb2bef223a8a
Papageorgiou, Giorgos, Falcon-suarez, Ismael, Chapman, Mark and Best, Angus
(2018)
Pressure-varying CO2 distribution affects the ultrasonic velocities of synthetic sandstones.
International Journal of Greenhouse Gas Control, 74, .
(doi:10.1016/j.ijggc.2018.03.022).
Abstract
We performed a novel experiment in which three synthetic sandstones – manufactured using a common method but having different porosities – were saturated with brine and progressively flooded with CO2 under constant confining pressure. The fluid pressure was varied around the critical pressure of CO2 and repeated measurements were made of resistivity, in order to assess the saturation, and elastic wave velocity during the flood. The measured saturated bulk moduli were higher than those predicted by the Gassmann–Wood theory, but were consistent with behaviour described by a recently derived poroelastic model which combines “patch” and “squirt” effects. Measurements on two of the samples followed a patch-based model while those on the highest porosity sample showed evidence of squirt-flow behaviour. Our analysis suggests that the appropriate fluid mixing law is pressure dependent, which is consistent with the notion that the effective patch size decreases as fluid pressure is increased. We derive simple empirical models for the patch dependence from fluid pressure which may be used in seismic modelling and interpretation exercises relevant to monitoring of CO2 injection.
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Accepted/In Press date: 27 March 2018
e-pub ahead of print date: 18 April 2018
Published date: July 2018
Identifiers
Local EPrints ID: 424889
URI: http://eprints.soton.ac.uk/id/eprint/424889
ISSN: 1750-5836
PURE UUID: 381631e1-beb2-4676-88c0-ba98854ee767
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Date deposited: 05 Oct 2018 11:53
Last modified: 15 Mar 2024 19:38
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Author:
Giorgos Papageorgiou
Author:
Ismael Falcon-suarez
Author:
Mark Chapman
Author:
Angus Best
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