The University of Southampton
University of Southampton Institutional Repository

First controlled sub-seabed CO2 release experiment: qualitative and quantitative analysis of high-resolution seismic reflection data

First controlled sub-seabed CO2 release experiment: qualitative and quantitative analysis of high-resolution seismic reflection data
First controlled sub-seabed CO2 release experiment: qualitative and quantitative analysis of high-resolution seismic reflection data
Carbon Capture and Storage is a promising climate change mitigation technology which allows the reduction of carbon dioxide emissions into the atmosphere. To assure a safe and permanent CO2 storage, it is vital to adapt efficient monitoring technologies allowing to better understand the fate of the injected CO2 within the subsurface, including its impact on sediment acoustic properties and migration into the overlying layers. The first-controlled sub-seabed CO2 release experiment, Quantifying and Monitoring Potential Ecosystem Impacts of Geological Carbon Storage (QICS), was completed in Ardmucknish Bay, Oban, where 4.2 tonnes of CO2 were injected into unconsolidated shallow marine sediments over 37 days. High-resolution seismic reflection data acquired syn-release reveal many CO2-related acoustic anomalies including seismic chimneys and enhanced reflectivity within the overburden, and bubbles within the water column. CO2 migration is interpreted to be controlled by sediment stratigraphy in the early stages of the experiment, whereas CO2 injection rate/ total injected volume overrode the stratigraphic control towards the end of gas release. Post-release seismic reflection data reveal that injected CO2 was mostly trapped below an erosional unconformity, Horizon 2, where a dip of 3.5° was found to significantly control the up-dip migration of the gaseous CO2 after the cessation of injection. The in situ CO2 content above Horizon 2 is also determined using the syn-release seismic reflection data combined with the Anderson and Hampton geaocoustics model, confirming that most of the injected CO2 was trapped below Horizon 2, or dissolved, during the QICS experiment.
Cevatoglu, Melis
bcd1a613-f62c-4ae2-bd6e-d59038b6940a
Bull, Jonathan M.
974037fd-544b-458f-98cc-ce8eca89e3c8
Vardy, Mark
8dd019dc-e57d-4b49-8f23-0fa6d246e69d
Wright, Ian C.
be2a8931-3932-4f1e-b387-43e3652bf3fc
Gernon, Thomas
658041a0-fdd1-4516-85f4-98895a39235e
Cevatoglu, Melis
bcd1a613-f62c-4ae2-bd6e-d59038b6940a
Bull, Jonathan M.
974037fd-544b-458f-98cc-ce8eca89e3c8
Vardy, Mark
8dd019dc-e57d-4b49-8f23-0fa6d246e69d
Wright, Ian C.
be2a8931-3932-4f1e-b387-43e3652bf3fc
Gernon, Thomas
658041a0-fdd1-4516-85f4-98895a39235e

Cevatoglu, Melis, Bull, Jonathan M., Vardy, Mark, Wright, Ian C. and Gernon, Thomas (2015) First controlled sub-seabed CO2 release experiment: qualitative and quantitative analysis of high-resolution seismic reflection data. IEAGHG The Risk Management and Environmental Research Meeting, United Kingdom. 29 Sep - 02 Oct 2015.

Record type: Conference or Workshop Item (Poster)

Abstract

Carbon Capture and Storage is a promising climate change mitigation technology which allows the reduction of carbon dioxide emissions into the atmosphere. To assure a safe and permanent CO2 storage, it is vital to adapt efficient monitoring technologies allowing to better understand the fate of the injected CO2 within the subsurface, including its impact on sediment acoustic properties and migration into the overlying layers. The first-controlled sub-seabed CO2 release experiment, Quantifying and Monitoring Potential Ecosystem Impacts of Geological Carbon Storage (QICS), was completed in Ardmucknish Bay, Oban, where 4.2 tonnes of CO2 were injected into unconsolidated shallow marine sediments over 37 days. High-resolution seismic reflection data acquired syn-release reveal many CO2-related acoustic anomalies including seismic chimneys and enhanced reflectivity within the overburden, and bubbles within the water column. CO2 migration is interpreted to be controlled by sediment stratigraphy in the early stages of the experiment, whereas CO2 injection rate/ total injected volume overrode the stratigraphic control towards the end of gas release. Post-release seismic reflection data reveal that injected CO2 was mostly trapped below an erosional unconformity, Horizon 2, where a dip of 3.5° was found to significantly control the up-dip migration of the gaseous CO2 after the cessation of injection. The in situ CO2 content above Horizon 2 is also determined using the syn-release seismic reflection data combined with the Anderson and Hampton geaocoustics model, confirming that most of the injected CO2 was trapped below Horizon 2, or dissolved, during the QICS experiment.

Full text not available from this repository.

More information

Published date: September 2015
Venue - Dates: IEAGHG The Risk Management and Environmental Research Meeting, United Kingdom, 2015-09-29 - 2015-10-02
Organisations: Geology & Geophysics, Marine Geoscience

Identifiers

Local EPrints ID: 382720
URI: https://eprints.soton.ac.uk/id/eprint/382720
PURE UUID: 09334c4d-a8af-4e8a-bc31-fbb97983b125

Catalogue record

Date deposited: 16 Oct 2015 12:29
Last modified: 17 Jul 2017 20:19

Export record

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of https://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×