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CO 2-brine flow-through on an Utsira Sand core sample: Experimental and modelling. Implications for the Sleipner storage field

CO 2-brine flow-through on an Utsira Sand core sample: Experimental and modelling. Implications for the Sleipner storage field
CO 2-brine flow-through on an Utsira Sand core sample: Experimental and modelling. Implications for the Sleipner storage field
Sleipner (North Sea) is the world’s first commercial-scale carbon capture and storage (CCS) project, active since 1996, with ∼17 million tonnes of CO2 stored. The main reservoir, Utsira Sand, constitutes an ideal host formation of exceptionally high porosity-permeability and large lateral extent. However, the extensive seismic time-lapse, gravity and electromagnetic monitoring surveys deployed at Sleipner have not been well-supported by laboratory measurements. Here, we investigate the geophysical and geomechanical response of an Utsira core sample for the first time, using controlled inflation/depletion cycles at variable CO2-to-brine fractional flow rates. Ultrasonic P-wave velocities and attenuations are measured together with electrical resistivity (converted into CO2-saturation), along with continuous axial and radial strain monitoring. Ultrasonic velocity and attenuation data were simultaneously inverted and results extrapolated to field-scale seismic-frequencies using a new rock physics theory, which combines patchy fluid distribution and squirt flow effects. It provides a velocity-saturation relationship of practical importance to CO2 plume monitoring. Furthermore, by combining ultrasonic and deformation data, we report empirical relations between pore pressure changes and geomechanical effects in the reservoir, for different saturation ranges. Our dataset complements and constrains existing geophysical monitoring surveys at Sleipner and, more generally, improves the understanding of shallow weakly-cemented sand reservoirs.
1750-5836
236-246
Falcon-Suarez, Ismael
54621ed9-a022-4f1e-8ac8-7c56ada8ad64
Papageorgiou, Giorgos
8181cca9-12a0-4fa6-93a3-d5711132bc87
Chadwick, Andy
072a70c2-da9a-4a43-b56b-a60184edb7e5
North, Laurence
65837b6b-40f1-4a1c-ba66-ec6ff2d7f84b
Best, Angus I.
cad03726-10f8-4f90-a3ba-5031665234c9
Chapman, Mark
087982f4-b96c-45d3-a773-3b54aad359dd
Falcon-Suarez, Ismael
54621ed9-a022-4f1e-8ac8-7c56ada8ad64
Papageorgiou, Giorgos
8181cca9-12a0-4fa6-93a3-d5711132bc87
Chadwick, Andy
072a70c2-da9a-4a43-b56b-a60184edb7e5
North, Laurence
65837b6b-40f1-4a1c-ba66-ec6ff2d7f84b
Best, Angus I.
cad03726-10f8-4f90-a3ba-5031665234c9
Chapman, Mark
087982f4-b96c-45d3-a773-3b54aad359dd

Falcon-Suarez, Ismael, Papageorgiou, Giorgos, Chadwick, Andy, North, Laurence, Best, Angus I. and Chapman, Mark (2018) CO 2-brine flow-through on an Utsira Sand core sample: Experimental and modelling. Implications for the Sleipner storage field. International Journal of Greenhouse Gas Control, 68, 236-246. (doi:10.1016/j.ijggc.2017.11.019).

Record type: Article

Abstract

Sleipner (North Sea) is the world’s first commercial-scale carbon capture and storage (CCS) project, active since 1996, with ∼17 million tonnes of CO2 stored. The main reservoir, Utsira Sand, constitutes an ideal host formation of exceptionally high porosity-permeability and large lateral extent. However, the extensive seismic time-lapse, gravity and electromagnetic monitoring surveys deployed at Sleipner have not been well-supported by laboratory measurements. Here, we investigate the geophysical and geomechanical response of an Utsira core sample for the first time, using controlled inflation/depletion cycles at variable CO2-to-brine fractional flow rates. Ultrasonic P-wave velocities and attenuations are measured together with electrical resistivity (converted into CO2-saturation), along with continuous axial and radial strain monitoring. Ultrasonic velocity and attenuation data were simultaneously inverted and results extrapolated to field-scale seismic-frequencies using a new rock physics theory, which combines patchy fluid distribution and squirt flow effects. It provides a velocity-saturation relationship of practical importance to CO2 plume monitoring. Furthermore, by combining ultrasonic and deformation data, we report empirical relations between pore pressure changes and geomechanical effects in the reservoir, for different saturation ranges. Our dataset complements and constrains existing geophysical monitoring surveys at Sleipner and, more generally, improves the understanding of shallow weakly-cemented sand reservoirs.

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Accepted/In Press date: 27 November 2017
e-pub ahead of print date: 6 December 2017
Published date: 1 January 2018

Identifiers

Local EPrints ID: 416457
URI: https://eprints.soton.ac.uk/id/eprint/416457
ISSN: 1750-5836
PURE UUID: f211d2eb-5f19-4469-aba2-ec716b3a5097

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Date deposited: 19 Dec 2017 17:30
Last modified: 16 Apr 2018 16:31

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Contributors

Author: Ismael Falcon-Suarez
Author: Giorgos Papageorgiou
Author: Andy Chadwick
Author: Laurence North
Author: Angus I. Best
Author: Mark Chapman

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