The effect of hydrate content on seismic attenuation: A case study for Mallik 2L-38 well data, Mackenzie delta, Canada


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), L14609. (doi:10.1029/2004GL020292).

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Description/Abstract

Observations of velocities in sediments containing gas hydrates 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.

Item Type: Article
Digital Object Identifier (DOI): doi:10.1029/2004GL020292
ISSNs: 0094-8276 (print)
Related URLs:
Keywords: gas hydrates
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ePrint ID: 9130
Date :
Date Event
2004Published
Date Deposited: 10 Sep 2004
Last Modified: 17 Apr 2017 00:03
Further Information:Google Scholar
URI: http://eprints.soton.ac.uk/id/eprint/9130

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