Observations of pore-scale growth patterns of carbon dioxide hydrate using X-ray computed microtomography

Xuan Hien Ta, Tae Sup Yun, Balasingam Muhunthan, Tae Hyuk Kwon

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

Natural and artificial gas hydrates with internal pores of nano to centimeters and weak grain-cementation have been widely reported, while the detailed formation process of grain-cementing hydrates remains poorly identified. Pore-scale morphology of carbon dioxide (CO2) hydrate formed in a partially brine-saturated porous medium was investigated via X-ray computed microtomography (X-ray CMT). Emphasis is placed on the pore-scale growth patterns of gas hydrate, including the growth of dendritic hydrate crystals on preformed hydrate and water-wetted grains, porous nature of the hydrate phase, volume expansion of more than 200% during the water-to-hydrate phase transformation, preference of unfrozen water wetting hydrophilic minerals, and the relevance to a weak cementation effect on macroscale physical properties. The presented pore-scale morphology and growth patterns of gas hydrate are expected in natural sediment settings where free gas is available for hydrate formation, such as active gas vents, gas seeps, mud volcanoes, permafrost gas hydrate provinces, and CO2 injected formation for the sake of geologic carbon storage; and in laboratory hydrate samples synthesized from partially brine-saturated sediments or formed from water-gas interfaces.

Original languageEnglish
Pages (from-to)912-924
Number of pages13
JournalGeochemistry, Geophysics, Geosystems
Volume16
Issue number3
DOIs
Publication statusPublished - 2015 Mar 1

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gas hydrate
Hydrates
Carbon Dioxide
hydrates
carbon dioxide
porosity
X rays
Gas hydrates
cementation
gas
brine
x rays
Gases
gases
water
mud volcano
Water
wetting
permafrost
carbon sequestration

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Geochemistry and Petrology

Cite this

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abstract = "Natural and artificial gas hydrates with internal pores of nano to centimeters and weak grain-cementation have been widely reported, while the detailed formation process of grain-cementing hydrates remains poorly identified. Pore-scale morphology of carbon dioxide (CO2) hydrate formed in a partially brine-saturated porous medium was investigated via X-ray computed microtomography (X-ray CMT). Emphasis is placed on the pore-scale growth patterns of gas hydrate, including the growth of dendritic hydrate crystals on preformed hydrate and water-wetted grains, porous nature of the hydrate phase, volume expansion of more than 200{\%} during the water-to-hydrate phase transformation, preference of unfrozen water wetting hydrophilic minerals, and the relevance to a weak cementation effect on macroscale physical properties. The presented pore-scale morphology and growth patterns of gas hydrate are expected in natural sediment settings where free gas is available for hydrate formation, such as active gas vents, gas seeps, mud volcanoes, permafrost gas hydrate provinces, and CO2 injected formation for the sake of geologic carbon storage; and in laboratory hydrate samples synthesized from partially brine-saturated sediments or formed from water-gas interfaces.",
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Observations of pore-scale growth patterns of carbon dioxide hydrate using X-ray computed microtomography. / Ta, Xuan Hien; Yun, Tae Sup; Muhunthan, Balasingam; Kwon, Tae Hyuk.

In: Geochemistry, Geophysics, Geosystems, Vol. 16, No. 3, 01.03.2015, p. 912-924.

Research output: Contribution to journalArticle

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