The effect of hydrate content on seismic attenuation: A case study for Mallik 2L-38 well data, Mackenzie delta, Canada
The effect of hydrate content on seismic attenuation: A case study for Mallik 2L-38 well data, Mackenzie delta, Canada
Observations of velocities in sediments containing gashydrates show that the strength of sediments increases with hydrate saturation. Hence it is expected that the attenuation of these sediments will decrease with increasing hydrate saturation. However, sonic log measurements in the Mallik 2L-38 well and cross hole tomography measurements in the Mallik field have shown that attenuation increases with hydrate saturation. We studied a range of mechanisms by which increasing hydrate saturation could cause increased attenuation. We found that a difference in permeability between the host sediment and the newly formed hydrate can produce the observed effect. We modelled attenuation in terms of Biot and squirt flow mechanisms in composite media. We have used our model to predict observed attenuations in the Mallik 2L-38 well, Mackenzie Delta, Canada.
gas hydrates
L14609
Chand, S.
079ed6bb-3458-497e-aa12-815ab79a4df8
Minshull, T.A.
bf413fb5-849e-4389-acd7-0cb0d644e6b8
2004
Chand, S.
079ed6bb-3458-497e-aa12-815ab79a4df8
Minshull, T.A.
bf413fb5-849e-4389-acd7-0cb0d644e6b8
Chand, S. and Minshull, T.A.
(2004)
The effect of hydrate content on seismic attenuation: A case study for Mallik 2L-38 well data, Mackenzie delta, Canada.
Geophysical Research Letters, 31 (14), .
(doi:10.1029/2004GL020292).
Abstract
Observations of velocities in sediments containing gashydrates show that the strength of sediments increases with hydrate saturation. Hence it is expected that the attenuation of these sediments will decrease with increasing hydrate saturation. However, sonic log measurements in the Mallik 2L-38 well and cross hole tomography measurements in the Mallik field have shown that attenuation increases with hydrate saturation. We studied a range of mechanisms by which increasing hydrate saturation could cause increased attenuation. We found that a difference in permeability between the host sediment and the newly formed hydrate can produce the observed effect. We modelled attenuation in terms of Biot and squirt flow mechanisms in composite media. We have used our model to predict observed attenuations in the Mallik 2L-38 well, Mackenzie Delta, Canada.
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chand&minshull_2004.pdf
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Published date: 2004
Keywords:
gas hydrates
Organisations:
Ocean and Earth Science
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Local EPrints ID: 9130
URI: http://eprints.soton.ac.uk/id/eprint/9130
ISSN: 0094-8276
PURE UUID: 64113cf9-fd47-4e68-b4c4-ecf40bc7365e
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Date deposited: 10 Sep 2004
Last modified: 16 Mar 2024 03:11
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Author:
S. Chand
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