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: | http://www.osti.gov/servlets/purl/1580838 https://www.osti.gov/biblio/1580838 https://doi.org/10.1016/j.marpetgeo.2019.04.004 |
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ftosti:oai:osti.gov:1580838 2023-07-30T04:04:50+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. 2023-06-30 application/pdf http://www.osti.gov/servlets/purl/1580838 https://www.osti.gov/biblio/1580838 https://doi.org/10.1016/j.marpetgeo.2019.04.004 unknown http://www.osti.gov/servlets/purl/1580838 https://www.osti.gov/biblio/1580838 https://doi.org/10.1016/j.marpetgeo.2019.04.004 doi:10.1016/j.marpetgeo.2019.04.004 2023 ftosti https://doi.org/10.1016/j.marpetgeo.2019.04.004 2023-07-11T09:38:40Z 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. Other/Unknown Material Methane hydrate SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) Marine and Petroleum Geology 104 451 467 |
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SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) |
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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. |
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 |
publishDate |
2023 |
url |
http://www.osti.gov/servlets/purl/1580838 https://www.osti.gov/biblio/1580838 https://doi.org/10.1016/j.marpetgeo.2019.04.004 |
genre |
Methane hydrate |
genre_facet |
Methane hydrate |
op_relation |
http://www.osti.gov/servlets/purl/1580838 https://www.osti.gov/biblio/1580838 https://doi.org/10.1016/j.marpetgeo.2019.04.004 doi:10.1016/j.marpetgeo.2019.04.004 |
op_doi |
https://doi.org/10.1016/j.marpetgeo.2019.04.004 |
container_title |
Marine and Petroleum Geology |
container_volume |
104 |
container_start_page |
451 |
op_container_end_page |
467 |
_version_ |
1772816449269661696 |