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Time-lapse imaging of CO2 migration within near-surface sediments during a controlled sub-seabed release experiment

Time-lapse imaging of CO2 migration within near-surface sediments during a controlled sub-seabed release experiment
Time-lapse imaging of CO2 migration within near-surface sediments during a controlled sub-seabed release experiment
The ability to detect and monitor any escape of carbon dioxide (CO2) from sub-seafloor CO2 storage reservoirs is essential for public acceptance of carbon capture and storage (CCS) as a climate change mitigation strategy. Here, we use repeated high-resolution seismic reflection surveys acquired using a chirp profiler mounted on an autonomous underwater vehicle (AUV), to image CO2 gas released into shallow sub-surface sediments above a potential CCS storage site at 120 m water depth in the North Sea. Observations of temporal changes in seismic reflectivity, attenuation, unit thickness and the bulk permeability of sediment were used to develop a four-stage model of the evolution of gas migration in shallow marine sediments: Proto-migration, Immature Migration, Mature Migration, and Pathway Closure. Bubble flow was initially enabled through the propagation of stable fractures but, over time, transitioned to dynamic fractures with an associated step change in permeability. Once the gas injection rate exceeded the rate at which gas could escape the coarser sediments overlying the injection point, gas began to pool along a grain size boundary. This enhanced understanding of the migration of free gas in near-surface sediments will help improve methods of detection and quantification of gas in subsurface marine sediments.
1750-5836
Roche, Ben
2746ee9e-1b87-4d2f-b4e1-dcdc0ca7a719
Bull, Jonathan
974037fd-544b-458f-98cc-ce8eca89e3c8
Moreno, Hector
3fe1141c-c2f4-475a-89ea-bec8a87388bd
Leighton, namrip
3e5262ce-1d7d-42eb-b013-fcc5c286bbae
Falcon-Suarez, Ismal H.
109926b5-467d-43fe-86df-c6faa4dd3ee8
Tholen, Madeline
fdacc9a2-563d-49d1-8054-113aea8cf62e
White, Paul
2dd2477b-5aa9-42e2-9d19-0806d994eaba
Provenzano, Giuseppe
0da03494-44a8-4536-8833-6cd4feb75882
Lichtschlag, Anna
be1568d9-cc63-4f85-bd38-a93dfd7e245f
Li, Jianghui
9c589194-00fa-4d42-abaf-53a32789cc5e
Faggetter, Michael, John
3aa02272-6072-4748-96ec-2e9c28362daf
Roche, Ben
2746ee9e-1b87-4d2f-b4e1-dcdc0ca7a719
Bull, Jonathan
974037fd-544b-458f-98cc-ce8eca89e3c8
Moreno, Hector
3fe1141c-c2f4-475a-89ea-bec8a87388bd
Leighton, namrip
3e5262ce-1d7d-42eb-b013-fcc5c286bbae
Falcon-Suarez, Ismal H.
109926b5-467d-43fe-86df-c6faa4dd3ee8
Tholen, Madeline
fdacc9a2-563d-49d1-8054-113aea8cf62e
White, Paul
2dd2477b-5aa9-42e2-9d19-0806d994eaba
Provenzano, Giuseppe
0da03494-44a8-4536-8833-6cd4feb75882
Lichtschlag, Anna
be1568d9-cc63-4f85-bd38-a93dfd7e245f
Li, Jianghui
9c589194-00fa-4d42-abaf-53a32789cc5e
Faggetter, Michael, John
3aa02272-6072-4748-96ec-2e9c28362daf

Roche, Ben, Bull, Jonathan, Moreno, Hector, Leighton, namrip, Falcon-Suarez, Ismal H., Tholen, Madeline, White, Paul, Provenzano, Giuseppe, Lichtschlag, Anna, Li, Jianghui and Faggetter, Michael, John (2021) Time-lapse imaging of CO2 migration within near-surface sediments during a controlled sub-seabed release experiment. International Journal of Greenhouse Gas Control, [103363]. (doi:10.1016/j.ijggc.2021.103363).

Record type: Article

Abstract

The ability to detect and monitor any escape of carbon dioxide (CO2) from sub-seafloor CO2 storage reservoirs is essential for public acceptance of carbon capture and storage (CCS) as a climate change mitigation strategy. Here, we use repeated high-resolution seismic reflection surveys acquired using a chirp profiler mounted on an autonomous underwater vehicle (AUV), to image CO2 gas released into shallow sub-surface sediments above a potential CCS storage site at 120 m water depth in the North Sea. Observations of temporal changes in seismic reflectivity, attenuation, unit thickness and the bulk permeability of sediment were used to develop a four-stage model of the evolution of gas migration in shallow marine sediments: Proto-migration, Immature Migration, Mature Migration, and Pathway Closure. Bubble flow was initially enabled through the propagation of stable fractures but, over time, transitioned to dynamic fractures with an associated step change in permeability. Once the gas injection rate exceeded the rate at which gas could escape the coarser sediments overlying the injection point, gas began to pool along a grain size boundary. This enhanced understanding of the migration of free gas in near-surface sediments will help improve methods of detection and quantification of gas in subsurface marine sediments.

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e-pub ahead of print date: July 2021

Identifiers

Local EPrints ID: 449572
URI: http://eprints.soton.ac.uk/id/eprint/449572
ISSN: 1750-5836
PURE UUID: 74d7235a-fe21-4b77-a88f-c8d0e7c1e63b
ORCID for namrip Leighton: ORCID iD orcid.org/0000-0002-1649-8750
ORCID for Paul White: ORCID iD orcid.org/0000-0002-4787-8713
ORCID for Jianghui Li: ORCID iD orcid.org/0000-0002-2956-5940

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Date deposited: 08 Jun 2021 16:31
Last modified: 09 Jun 2021 01:52

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Contributors

Author: Ben Roche
Author: Jonathan Bull
Author: Hector Moreno
Author: namrip Leighton ORCID iD
Author: Ismal H. Falcon-Suarez
Author: Madeline Tholen
Author: Paul White ORCID iD
Author: Giuseppe Provenzano
Author: Anna Lichtschlag
Author: Jianghui Li ORCID iD
Author: Michael, John Faggetter

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