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Presence and consequences of coexisting methane gas with hydrate under two phase water-hydrate stability conditions

Presence and consequences of coexisting methane gas with hydrate under two phase water-hydrate stability conditions
Presence and consequences of coexisting methane gas with hydrate under two phase water-hydrate stability conditions
Methane hydrate saturation estimates from remote geophysical data and borehole logs are needed to assess the role of hydrates in climate change, continental slope stability, and energy resource potential. Here we present laboratory hydrate formation/dissociation experiments in which we determined the methane hydrate content independently from pore pressure and temperature and from electrical resistivity. Using these laboratory experiments, we demonstrate that hydrate formation does not take up all the methane gas or water even if the system is under two phase water-hydrate stability conditions and gas is well distributed in the sample. The experiment started with methane gas and water saturations of 16.5% and 83.5%, respectively; during the experiment, hydrate saturation proceeded up to 26% along with 12% gas and 62% water remaining in the system. The coexistence of hydrate and gas is one possible explanation for discrepancies between estimates of hydrate saturation from electrical and acoustic methods. We suggest that an important mechanism for this coexistence is the formation of a hydrate film enveloping methane gas bubbles, trapping the remaining gas inside.
2169-9356
3377-3390
Sahoo, Sourav K.
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Marin-Moreno, Hector
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North, Laurence J.
65837b6b-40f1-4a1c-ba66-ec6ff2d7f84b
Falcon-Suarez, Ismael
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Madhusudhan, Bangalore N.
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Best, Angus I.
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Minshull, Tim. A.
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Sahoo, Sourav K.
6dab0376-36df-44c5-9f36-cb4a29d9b03b
Marin-Moreno, Hector
d1daa2dc-3ece-4b9b-914a-0e463b77d414
North, Laurence J.
65837b6b-40f1-4a1c-ba66-ec6ff2d7f84b
Falcon-Suarez, Ismael
9e8022b5-8799-4326-8d5b-0ed46de3b25a
Madhusudhan, Bangalore N.
e139e3d3-2992-4579-b3f0-4eec3ddae98c
Best, Angus I.
cad03726-10f8-4f90-a3ba-5031665234c9
Minshull, Tim. A.
bf413fb5-849e-4389-acd7-0cb0d644e6b8

Sahoo, Sourav K., Marin-Moreno, Hector, North, Laurence J., Falcon-Suarez, Ismael, Madhusudhan, Bangalore N., Best, Angus I. and Minshull, Tim. A. (2018) Presence and consequences of coexisting methane gas with hydrate under two phase water-hydrate stability conditions. Journal of Geophysical Research: Solid Earth, 123 (5), 3377-3390. (doi:10.1029/2018JB015598).

Record type: Article

Abstract

Methane hydrate saturation estimates from remote geophysical data and borehole logs are needed to assess the role of hydrates in climate change, continental slope stability, and energy resource potential. Here we present laboratory hydrate formation/dissociation experiments in which we determined the methane hydrate content independently from pore pressure and temperature and from electrical resistivity. Using these laboratory experiments, we demonstrate that hydrate formation does not take up all the methane gas or water even if the system is under two phase water-hydrate stability conditions and gas is well distributed in the sample. The experiment started with methane gas and water saturations of 16.5% and 83.5%, respectively; during the experiment, hydrate saturation proceeded up to 26% along with 12% gas and 62% water remaining in the system. The coexistence of hydrate and gas is one possible explanation for discrepancies between estimates of hydrate saturation from electrical and acoustic methods. We suggest that an important mechanism for this coexistence is the formation of a hydrate film enveloping methane gas bubbles, trapping the remaining gas inside.

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2018JB015598 - Accepted Manuscript
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Sahoo et al 2018 JGR - Version of Record
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Accepted/In Press date: 4 May 2018
e-pub ahead of print date: 11 May 2018
Published date: May 2018

Identifiers

Local EPrints ID: 420768
URI: http://eprints.soton.ac.uk/id/eprint/420768
ISSN: 2169-9356
PURE UUID: 2fb3dab2-84f2-4358-b572-723c48c4b459
ORCID for Bangalore N. Madhusudhan: ORCID iD orcid.org/0000-0002-2570-5934
ORCID for Tim. A. Minshull: ORCID iD orcid.org/0000-0002-8202-1379

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Date deposited: 16 May 2018 16:30
Last modified: 07 Oct 2020 05:40

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Contributors

Author: Sourav K. Sahoo
Author: Hector Marin-Moreno
Author: Laurence J. North
Author: Ismael Falcon-Suarez
Author: Angus I. Best

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