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Gas migration pathways, controlling mechanisms and changes in sediment acoustic properties observed in a controlled sub-seabed CO2 release experiment

Gas migration pathways, controlling mechanisms and changes in sediment acoustic properties observed in a controlled sub-seabed CO2 release experiment
Gas migration pathways, controlling mechanisms and changes in sediment acoustic properties observed in a controlled sub-seabed CO2 release experiment
Carbon capture and storage (CCS) is a key technology to potentially mitigate global warming by reducing carbon dioxide (CO2) emissions from industrial facilities and power generation that escape into the atmosphere. To broaden the usage of geological storage as a viable climate mitigation option, it is vital to understand CO2 behaviour after its injection within a storage reservoir, including its potential migration through overlying sediments, as well as biogeochemical and ecological impacts in the event of leakage.

The impacts of a CO2 release were investigated by a controlled release experiment that injected CO2 at a known flux into shallow, under-consolidated marine sediments for 37 days. Repeated high-resolution 2D seismic reflection surveying, both pre-release and syn-release, allows the detection of CO2-related anomalies, including: seismic chimneys; enhanced reflectors within the subsurface; and bubbles within the water column. In addition, reflection coefficient and seismic attenuation values calculated for each repeat survey, allow the impact of CO2 flux on sediment acoustic properties to be comparatively monitored throughout the gas release. CO2 migration is interpreted as being predominantly controlled by sediment stratigraphy in the early stages of the experiment. However, either the increasing flow rate, or the total injected volume become the dominant factors determining CO2 migration later in the experiment.
CO2 injection, 2D seismic reflection, Gas migration, Reflection coefficient, Attenuation
1750-5836
26-43
Cevatoglu, Melis
bcd1a613-f62c-4ae2-bd6e-d59038b6940a
Bull, Jonathan M.
974037fd-544b-458f-98cc-ce8eca89e3c8
Vardy, Mark E.
8dd019dc-e57d-4b49-8f23-0fa6d246e69d
Gernon, Thomas M.
658041a0-fdd1-4516-85f4-98895a39235e
Wright, Ian C.
be2a8931-3932-4f1e-b387-43e3652bf3fc
Long, David
40d62863-d9b2-4bcb-8e90-0152c22c636a
Cevatoglu, Melis
bcd1a613-f62c-4ae2-bd6e-d59038b6940a
Bull, Jonathan M.
974037fd-544b-458f-98cc-ce8eca89e3c8
Vardy, Mark E.
8dd019dc-e57d-4b49-8f23-0fa6d246e69d
Gernon, Thomas M.
658041a0-fdd1-4516-85f4-98895a39235e
Wright, Ian C.
be2a8931-3932-4f1e-b387-43e3652bf3fc
Long, David
40d62863-d9b2-4bcb-8e90-0152c22c636a

Cevatoglu, Melis, Bull, Jonathan M., Vardy, Mark E., Gernon, Thomas M., Wright, Ian C. and Long, David (2015) Gas migration pathways, controlling mechanisms and changes in sediment acoustic properties observed in a controlled sub-seabed CO2 release experiment. International Journal of Greenhouse Gas Control, 38, 26-43. (doi:10.1016/j.ijggc.2015.03.005).

Record type: Article

Abstract

Carbon capture and storage (CCS) is a key technology to potentially mitigate global warming by reducing carbon dioxide (CO2) emissions from industrial facilities and power generation that escape into the atmosphere. To broaden the usage of geological storage as a viable climate mitigation option, it is vital to understand CO2 behaviour after its injection within a storage reservoir, including its potential migration through overlying sediments, as well as biogeochemical and ecological impacts in the event of leakage.

The impacts of a CO2 release were investigated by a controlled release experiment that injected CO2 at a known flux into shallow, under-consolidated marine sediments for 37 days. Repeated high-resolution 2D seismic reflection surveying, both pre-release and syn-release, allows the detection of CO2-related anomalies, including: seismic chimneys; enhanced reflectors within the subsurface; and bubbles within the water column. In addition, reflection coefficient and seismic attenuation values calculated for each repeat survey, allow the impact of CO2 flux on sediment acoustic properties to be comparatively monitored throughout the gas release. CO2 migration is interpreted as being predominantly controlled by sediment stratigraphy in the early stages of the experiment. However, either the increasing flow rate, or the total injected volume become the dominant factors determining CO2 migration later in the experiment.

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Published date: July 2015
Keywords: CO2 injection, 2D seismic reflection, Gas migration, Reflection coefficient, Attenuation
Organisations: Geology & Geophysics, Marine Geoscience

Identifiers

Local EPrints ID: 378222
URI: http://eprints.soton.ac.uk/id/eprint/378222
ISSN: 1750-5836
PURE UUID: 86c53573-dd7a-45ac-9b54-f624e71d6042

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Date deposited: 22 Jun 2015 09:47
Last modified: 30 Sep 2019 18:50

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