Geophysical properties and dynamic response of methane-hydrate-bearing sediments to hydrate formation and decomposition

Research output: Chapter in Book/Report/Conference proceedingChapter

Abstract

Formation and decomposition of gas hydrates could have a major impact on geophysical and geomechanical properties of hydrate-bearing sediments, therefore, they play a crucial role in seafloor and wellbore stability. Subsea landslides and wellbore collapses are related to dynamic response of sedimentary formations to any geodynamic disturbances.

In this study, dynamic responses of methane hydrate-bearing sediments to hydrate formation and dissociation have been investigated using ultrasonic wave techniques. The results show that ultrasonic waves can be used to investigate the dynamic process of gas-hydrate formation and dissociation in sediments. Geophysical properties of methane-hydrate-bearing sediments composed of silica sand, and silica sand with kaolinite or montmorillonite were determined. The results demonstrate that the presence of the clays significantly increases the compressibility and shear modulus of the sediments. In depressurization tests, geomechanical responses show that methane-hydrate-bearing sediments suddenly become highly compressible at the hydrate dissociation pressure. Furthermore, the results show that the sediments with the clays, especially with montmorillonite, will deform more severely than pure silica sand when the system pressure reaches the dissociation point of methane hydrates. Large instantaneous strains at the dissociation pressure of methane hydrate might be a great risk to trigger large seafloor landslides and wellbore collapse.
Original languageEnglish
Title of host publicationGeophysical characterization of gas hydrates
EditorsMichael Riedel, Eleanor C. Willoughby, Satinder Chopra
PublisherSociety of Exploration Geophysicists
Pages329-335
Number of pages7
ISBN (Print)9781560802181
DOIs
Publication statusPublished - Nov 2010

Publication series

NameGeophysical developments series
PublisherSociety of Exploration Geophysicists
Volume14

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dynamic response
methane
decomposition
sediment
silica
gas hydrate
montmorillonite
sand
landslide
seafloor
clay
shear modulus
compressibility
geodynamics
kaolinite
disturbance

Cite this

Yang, J., & Tohidi Kalorazi, B. (2010). Geophysical properties and dynamic response of methane-hydrate-bearing sediments to hydrate formation and decomposition. In M. Riedel, E. C. Willoughby, & S. Chopra (Eds.), Geophysical characterization of gas hydrates (pp. 329-335). (Geophysical developments series; Vol. 14). Society of Exploration Geophysicists. https://doi.org/10.1190/1.9781560802197.ch23
Yang, Jinhai ; Tohidi Kalorazi, Bahman. / Geophysical properties and dynamic response of methane-hydrate-bearing sediments to hydrate formation and decomposition. Geophysical characterization of gas hydrates. editor / Michael Riedel ; Eleanor C. Willoughby ; Satinder Chopra. Society of Exploration Geophysicists, 2010. pp. 329-335 (Geophysical developments series).
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abstract = "Formation and decomposition of gas hydrates could have a major impact on geophysical and geomechanical properties of hydrate-bearing sediments, therefore, they play a crucial role in seafloor and wellbore stability. Subsea landslides and wellbore collapses are related to dynamic response of sedimentary formations to any geodynamic disturbances. In this study, dynamic responses of methane hydrate-bearing sediments to hydrate formation and dissociation have been investigated using ultrasonic wave techniques. The results show that ultrasonic waves can be used to investigate the dynamic process of gas-hydrate formation and dissociation in sediments. Geophysical properties of methane-hydrate-bearing sediments composed of silica sand, and silica sand with kaolinite or montmorillonite were determined. The results demonstrate that the presence of the clays significantly increases the compressibility and shear modulus of the sediments. In depressurization tests, geomechanical responses show that methane-hydrate-bearing sediments suddenly become highly compressible at the hydrate dissociation pressure. Furthermore, the results show that the sediments with the clays, especially with montmorillonite, will deform more severely than pure silica sand when the system pressure reaches the dissociation point of methane hydrates. Large instantaneous strains at the dissociation pressure of methane hydrate might be a great risk to trigger large seafloor landslides and wellbore collapse.",
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Yang, J & Tohidi Kalorazi, B 2010, Geophysical properties and dynamic response of methane-hydrate-bearing sediments to hydrate formation and decomposition. in M Riedel, EC Willoughby & S Chopra (eds), Geophysical characterization of gas hydrates. Geophysical developments series, vol. 14, Society of Exploration Geophysicists, pp. 329-335. https://doi.org/10.1190/1.9781560802197.ch23

Geophysical properties and dynamic response of methane-hydrate-bearing sediments to hydrate formation and decomposition. / Yang, Jinhai; Tohidi Kalorazi, Bahman.

Geophysical characterization of gas hydrates. ed. / Michael Riedel; Eleanor C. Willoughby; Satinder Chopra. Society of Exploration Geophysicists, 2010. p. 329-335 (Geophysical developments series; Vol. 14).

Research output: Chapter in Book/Report/Conference proceedingChapter

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AU - Yang, Jinhai

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N2 - Formation and decomposition of gas hydrates could have a major impact on geophysical and geomechanical properties of hydrate-bearing sediments, therefore, they play a crucial role in seafloor and wellbore stability. Subsea landslides and wellbore collapses are related to dynamic response of sedimentary formations to any geodynamic disturbances. In this study, dynamic responses of methane hydrate-bearing sediments to hydrate formation and dissociation have been investigated using ultrasonic wave techniques. The results show that ultrasonic waves can be used to investigate the dynamic process of gas-hydrate formation and dissociation in sediments. Geophysical properties of methane-hydrate-bearing sediments composed of silica sand, and silica sand with kaolinite or montmorillonite were determined. The results demonstrate that the presence of the clays significantly increases the compressibility and shear modulus of the sediments. In depressurization tests, geomechanical responses show that methane-hydrate-bearing sediments suddenly become highly compressible at the hydrate dissociation pressure. Furthermore, the results show that the sediments with the clays, especially with montmorillonite, will deform more severely than pure silica sand when the system pressure reaches the dissociation point of methane hydrates. Large instantaneous strains at the dissociation pressure of methane hydrate might be a great risk to trigger large seafloor landslides and wellbore collapse.

AB - Formation and decomposition of gas hydrates could have a major impact on geophysical and geomechanical properties of hydrate-bearing sediments, therefore, they play a crucial role in seafloor and wellbore stability. Subsea landslides and wellbore collapses are related to dynamic response of sedimentary formations to any geodynamic disturbances. In this study, dynamic responses of methane hydrate-bearing sediments to hydrate formation and dissociation have been investigated using ultrasonic wave techniques. The results show that ultrasonic waves can be used to investigate the dynamic process of gas-hydrate formation and dissociation in sediments. Geophysical properties of methane-hydrate-bearing sediments composed of silica sand, and silica sand with kaolinite or montmorillonite were determined. The results demonstrate that the presence of the clays significantly increases the compressibility and shear modulus of the sediments. In depressurization tests, geomechanical responses show that methane-hydrate-bearing sediments suddenly become highly compressible at the hydrate dissociation pressure. Furthermore, the results show that the sediments with the clays, especially with montmorillonite, will deform more severely than pure silica sand when the system pressure reaches the dissociation point of methane hydrates. Large instantaneous strains at the dissociation pressure of methane hydrate might be a great risk to trigger large seafloor landslides and wellbore collapse.

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BT - Geophysical characterization of gas hydrates

A2 - Riedel, Michael

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PB - Society of Exploration Geophysicists

ER -

Yang J, Tohidi Kalorazi B. Geophysical properties and dynamic response of methane-hydrate-bearing sediments to hydrate formation and decomposition. In Riedel M, Willoughby EC, Chopra S, editors, Geophysical characterization of gas hydrates. Society of Exploration Geophysicists. 2010. p. 329-335. (Geophysical developments series). https://doi.org/10.1190/1.9781560802197.ch23