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

Details 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

Jul 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3114609c&link_type=abstract

Geophysical Research Letters, Volume 31, Issue 14, CiteID L14609

Physics

Geophysics

11

Exploration Geophysics: Seismic Methods (3025), Mathematical Geophysics: Modeling, Physical Properties Of Rocks: Permeability And Porosity, Physical Properties Of Rocks: Wave Attenuation, Oceanography: General: Remote Sensing And Electromagnetic Processes (0689)

Scientific paper

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.

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