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Core-scale geophysical and hydromechanical analysis of seabed sediments affected by CO2 venting

Core-scale geophysical and hydromechanical analysis of seabed sediments affected by CO2 venting
Core-scale geophysical and hydromechanical analysis of seabed sediments affected by CO2 venting
Safe offshore Carbon Capture Utilization and Storage (CCUS) includes monitoring of the subseafloor, to identify and assess potential CO2 leaks from the geological reservoir through seal bypass structures. We simulated CO2-leaking through shallow marine sediments of the North Sea, using two gravity core samples from ∼1 and ∼2.1 m below seafloor. Both samples were subjected to brine−CO2 flow-through, with continuous monitoring of their transport, elastic and mechanical properties, using electrical resistivity, permeability, P-wave velocity and attenuation, and axial strains. We used the collected geophysical data to calibrate a resistivity-saturation model based on Archie’s law extended for clay content, and a rock physics for the elastic properties. The P-wave attributes detected the presence of CO2 in the sediment, but failed in providing accurate estimates of the CO2 saturation. Our results estimate porosities of 0.44 and 0.54, a background permeability of ∼10−15 and ∼10-17 m2, and maximum CO2 saturation of 18 % and 10 % (±5 %), for the sandier (shallower) and muddier (deeper) sample, respectively. The finer-grained sample likely suffered some degree of gas-induced fracturing, exhibiting an effective CO2 permeability increase sharper than the coarser-grained sample. Our core-scale multidisciplinary experiment contributes to improve the general interpretation of shallow sub-seafloor gas distribution and migration patterns.
CO storage, Elastic, Electrical resistivity, Marine sediments, Waves
1750-5836
Falcon-suarez, Ismael Himar
f5cdbc61-326b-424d-a90f-593a8698a4d2
Lichtschlag, Anna
be1568d9-cc63-4f85-bd38-a93dfd7e245f
Marin-moreno, Hector
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Papageorgiou, Giorgos
8181cca9-12a0-4fa6-93a3-d5711132bc87
Sahoo, Sourav K.
6dab0376-36df-44c5-9f36-cb4a29d9b03b
Roche, Ben
2746ee9e-1b87-4d2f-b4e1-dcdc0ca7a719
Callow, Ben
15166203-d3e6-4b28-8369-e99e1bd00240
Gehrmann, Romina A.s.
1ee547b2-aa53-4d38-9d36-a2ccc3aa52e2
Chapman, Mark
b98edf80-a68b-44cb-a681-bdb3268f648e
North, Laurence
65837b6b-40f1-4a1c-ba66-ec6ff2d7f84b
Falcon-suarez, Ismael Himar
f5cdbc61-326b-424d-a90f-593a8698a4d2
Lichtschlag, Anna
be1568d9-cc63-4f85-bd38-a93dfd7e245f
Marin-moreno, Hector
3fe1141c-c2f4-475a-89ea-bec8a87388bd
Papageorgiou, Giorgos
8181cca9-12a0-4fa6-93a3-d5711132bc87
Sahoo, Sourav K.
6dab0376-36df-44c5-9f36-cb4a29d9b03b
Roche, Ben
2746ee9e-1b87-4d2f-b4e1-dcdc0ca7a719
Callow, Ben
15166203-d3e6-4b28-8369-e99e1bd00240
Gehrmann, Romina A.s.
1ee547b2-aa53-4d38-9d36-a2ccc3aa52e2
Chapman, Mark
b98edf80-a68b-44cb-a681-bdb3268f648e
North, Laurence
65837b6b-40f1-4a1c-ba66-ec6ff2d7f84b

Falcon-suarez, Ismael Himar, Lichtschlag, Anna, Marin-moreno, Hector, Papageorgiou, Giorgos, Sahoo, Sourav K., Roche, Ben, Callow, Ben, Gehrmann, Romina A.s., Chapman, Mark and North, Laurence (2021) Core-scale geophysical and hydromechanical analysis of seabed sediments affected by CO2 venting. International Journal of Greenhouse Gas Control, 108, [103332]. (doi:10.1016/j.ijggc.2021.103332).

Record type: Article

Abstract

Safe offshore Carbon Capture Utilization and Storage (CCUS) includes monitoring of the subseafloor, to identify and assess potential CO2 leaks from the geological reservoir through seal bypass structures. We simulated CO2-leaking through shallow marine sediments of the North Sea, using two gravity core samples from ∼1 and ∼2.1 m below seafloor. Both samples were subjected to brine−CO2 flow-through, with continuous monitoring of their transport, elastic and mechanical properties, using electrical resistivity, permeability, P-wave velocity and attenuation, and axial strains. We used the collected geophysical data to calibrate a resistivity-saturation model based on Archie’s law extended for clay content, and a rock physics for the elastic properties. The P-wave attributes detected the presence of CO2 in the sediment, but failed in providing accurate estimates of the CO2 saturation. Our results estimate porosities of 0.44 and 0.54, a background permeability of ∼10−15 and ∼10-17 m2, and maximum CO2 saturation of 18 % and 10 % (±5 %), for the sandier (shallower) and muddier (deeper) sample, respectively. The finer-grained sample likely suffered some degree of gas-induced fracturing, exhibiting an effective CO2 permeability increase sharper than the coarser-grained sample. Our core-scale multidisciplinary experiment contributes to improve the general interpretation of shallow sub-seafloor gas distribution and migration patterns.

Text
IH_Falcon_Suarez_etal_SI_STEMMCCS_clean_final - Accepted Manuscript
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Accepted/In Press date: 5 April 2021
e-pub ahead of print date: 15 April 2021
Published date: 1 June 2021
Keywords: CO storage, Elastic, Electrical resistivity, Marine sediments, Waves

Identifiers

Local EPrints ID: 448977
URI: http://eprints.soton.ac.uk/id/eprint/448977
ISSN: 1750-5836
PURE UUID: afbae8b0-dd1a-4c08-a46d-3417fe4e8039
ORCID for Romina A.s. Gehrmann: ORCID iD orcid.org/0000-0002-3099-2771

Catalogue record

Date deposited: 12 May 2021 16:32
Last modified: 26 Nov 2021 03:05

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Contributors

Author: Ismael Himar Falcon-suarez
Author: Anna Lichtschlag
Author: Hector Marin-moreno
Author: Giorgos Papageorgiou
Author: Sourav K. Sahoo
Author: Ben Roche
Author: Ben Callow
Author: Romina A.s. Gehrmann ORCID iD
Author: Mark Chapman
Author: Laurence North

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