Pore habit of methane hydrate and its evolution in sediment matrix – Laboratory visualization with phase-contrast micro-CT
Describing the pore habit of methane hydrate in sediment matrices is essential for understanding natural distribution of methane hydrate, methane trace (transport and solidification) in the hydrate stability zone, physical properties of hydrate-bearing sediments, and the associated influence on pote...
Published in: | Marine and Petroleum Geology |
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Online Access: | https://oceanrep.geomar.de/id/eprint/47979/ https://oceanrep.geomar.de/id/eprint/47979/1/lei2019.pdf https://doi.org/10.1016/j.marpetgeo.2019.04.004 |
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ftoceanrep:oai:oceanrep.geomar.de:47979 2023-05-15T17:11:13+02:00 Pore habit of methane hydrate and its evolution in sediment matrix – Laboratory visualization with phase-contrast micro-CT Lei, Liang Seol, Yongkoo Choi, Jeong-Hoon Kneafsey, Timothy J. 2019 text https://oceanrep.geomar.de/id/eprint/47979/ https://oceanrep.geomar.de/id/eprint/47979/1/lei2019.pdf https://doi.org/10.1016/j.marpetgeo.2019.04.004 en eng Elsevier https://oceanrep.geomar.de/id/eprint/47979/1/lei2019.pdf Lei, L. , Seol, Y., Choi, J. H. and Kneafsey, T. J. (2019) Pore habit of methane hydrate and its evolution in sediment matrix – Laboratory visualization with phase-contrast micro-CT. Marine and Petroleum Geology, 104 . pp. 451-467. DOI 10.1016/j.marpetgeo.2019.04.004 <https://doi.org/10.1016/j.marpetgeo.2019.04.004>. doi:10.1016/j.marpetgeo.2019.04.004 info:eu-repo/semantics/restrictedAccess Article PeerReviewed 2019 ftoceanrep https://doi.org/10.1016/j.marpetgeo.2019.04.004 2023-04-07T15:47:44Z Describing the pore habit of methane hydrate in sediment matrices is essential for understanding natural distribution of methane hydrate, methane trace (transport and solidification) in the hydrate stability zone, physical properties of hydrate-bearing sediments, and the associated influence on potential gas production. Pore habit visualization in natural media at pore scale even with laboratory synthesized cores has been challenging due to the similar densities of methane hydrate from pore liquid. In this work, we used phase-contrast assisted micro-CT with potassium iodine-doped brine to visualize four phases: sand particles, pore fluid, methane hydrate and methane gas. This study visualizes the pore habit of methane hydrate at various stages including during hydrate formation in excess-gas systems, its evolution after brine injection to replace pore fluid, and hydrate formation in excess-water systems. Hydrate tends to adopt round and smooth surfaces when in contact with water while exhibits relatively angular interfaces when in contact with methane gas. Hydrate formation in excess-gas systems results in a partial cementing and partial mineral-coating pore habit, while hydrate in excess-water systems develops mainly as pore-filling, and locally cementing or mineral-coating where big gas pockets exist at the initial state. Pore liquid replacement from methane gas to brine triggers a shift of hydrate pore habit towards pore-filling. Methane hydrate evolution over time produces bigger hydrate particles but with less contact area with sand particles. The effects of hydrate pore habit become less important as hydrate particle size exceeds the pore size. Additionally, hydrate formation could trap residual methane gas and brine as inclusions. Article in Journal/Newspaper Methane hydrate OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Marine and Petroleum Geology 104 451 467 |
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English |
description |
Describing the pore habit of methane hydrate in sediment matrices is essential for understanding natural distribution of methane hydrate, methane trace (transport and solidification) in the hydrate stability zone, physical properties of hydrate-bearing sediments, and the associated influence on potential gas production. Pore habit visualization in natural media at pore scale even with laboratory synthesized cores has been challenging due to the similar densities of methane hydrate from pore liquid. In this work, we used phase-contrast assisted micro-CT with potassium iodine-doped brine to visualize four phases: sand particles, pore fluid, methane hydrate and methane gas. This study visualizes the pore habit of methane hydrate at various stages including during hydrate formation in excess-gas systems, its evolution after brine injection to replace pore fluid, and hydrate formation in excess-water systems. Hydrate tends to adopt round and smooth surfaces when in contact with water while exhibits relatively angular interfaces when in contact with methane gas. Hydrate formation in excess-gas systems results in a partial cementing and partial mineral-coating pore habit, while hydrate in excess-water systems develops mainly as pore-filling, and locally cementing or mineral-coating where big gas pockets exist at the initial state. Pore liquid replacement from methane gas to brine triggers a shift of hydrate pore habit towards pore-filling. Methane hydrate evolution over time produces bigger hydrate particles but with less contact area with sand particles. The effects of hydrate pore habit become less important as hydrate particle size exceeds the pore size. Additionally, hydrate formation could trap residual methane gas and brine as inclusions. |
format |
Article in Journal/Newspaper |
author |
Lei, Liang Seol, Yongkoo Choi, Jeong-Hoon Kneafsey, Timothy J. |
spellingShingle |
Lei, Liang Seol, Yongkoo Choi, Jeong-Hoon Kneafsey, Timothy J. Pore habit of methane hydrate and its evolution in sediment matrix – Laboratory visualization with phase-contrast micro-CT |
author_facet |
Lei, Liang Seol, Yongkoo Choi, Jeong-Hoon Kneafsey, Timothy J. |
author_sort |
Lei, Liang |
title |
Pore habit of methane hydrate and its evolution in sediment matrix – Laboratory visualization with phase-contrast micro-CT |
title_short |
Pore habit of methane hydrate and its evolution in sediment matrix – Laboratory visualization with phase-contrast micro-CT |
title_full |
Pore habit of methane hydrate and its evolution in sediment matrix – Laboratory visualization with phase-contrast micro-CT |
title_fullStr |
Pore habit of methane hydrate and its evolution in sediment matrix – Laboratory visualization with phase-contrast micro-CT |
title_full_unstemmed |
Pore habit of methane hydrate and its evolution in sediment matrix – Laboratory visualization with phase-contrast micro-CT |
title_sort |
pore habit of methane hydrate and its evolution in sediment matrix – laboratory visualization with phase-contrast micro-ct |
publisher |
Elsevier |
publishDate |
2019 |
url |
https://oceanrep.geomar.de/id/eprint/47979/ https://oceanrep.geomar.de/id/eprint/47979/1/lei2019.pdf https://doi.org/10.1016/j.marpetgeo.2019.04.004 |
genre |
Methane hydrate |
genre_facet |
Methane hydrate |
op_relation |
https://oceanrep.geomar.de/id/eprint/47979/1/lei2019.pdf Lei, L. , Seol, Y., Choi, J. H. and Kneafsey, T. J. (2019) Pore habit of methane hydrate and its evolution in sediment matrix – Laboratory visualization with phase-contrast micro-CT. Marine and Petroleum Geology, 104 . pp. 451-467. DOI 10.1016/j.marpetgeo.2019.04.004 <https://doi.org/10.1016/j.marpetgeo.2019.04.004>. doi:10.1016/j.marpetgeo.2019.04.004 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1016/j.marpetgeo.2019.04.004 |
container_title |
Marine and Petroleum Geology |
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104 |
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451 |
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467 |
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1766068040177287168 |