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Amplitude blanking related to the pore-filling of gas hydrate in sediments

Marine Geophysical Researches

By:
and
DOI: 10.1023/A:1010371308699

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Abstract

Seismic indicators of gas-hydrate-bearing sediments include elevated interval velocities and amplitude reduction of seismic reflections owing to the presence of gas hydrate in the sediment's pore spaces. However, large amplitude blanking with relatively low interval velocities observed at the Blake Ridge has been enigmatic because realistic seismic models were absent to explain the observation. This study proposes models in which the gas hydrate concentrations vary in proportion to the porosity. Where gas hydrate concentrations are greater in more porous media, a significant amplitude blanking can be achieved with relatively low interval velocity. Depending on the amount of gas hydrate concentration in the pore space, reflection amplitudes from hydrate-bearing sediments can be much less, less or greater than those from corresponding non-hydrate-bearing sediments.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Amplitude blanking related to the pore-filling of gas hydrate in sediments
Series title:
Marine Geophysical Researches
DOI:
10.1023/A:1010371308699
Volume
22
Issue:
2
Year Published:
2001
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Marine Geophysical Researches
First page:
101
Last page:
109
Number of Pages:
9