Physics – Geophysics
Scientific paper
Jul 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26.2021h&link_type=abstract
Geophysical Research Letters, Volume 26, Issue 13, p. 2021-2024
Physics
Geophysics
69
Physical Properties Of Rocks, Physical Properties Of Rocks: Acoustic Properties, Marine Geology And Geophysics, Mathematical Geophysics: Modeling
Scientific paper
We offer a first-principle-based effective medium model for elastic-wave velocity in unconsolidated, high porosity, ocean bottom sediments containing gas hydrate. The dry sediment frame elastic constants depend on porosity, elastic moduli of the solid phase, and effective pressure. Elastic moduli of saturated sediment are calculated from those of the dry frame using Gassmann's equation. To model the effect of gas hydrate on sediment elastic moduli we use two separate assumptions: (a) hydrate modifies the pore fluid elastic properties without affecting the frame; (b) hydrate becomes a component of the solid phase, modifying the elasticity of the frame. The goal of the modeling is to predict the amount of hydrate in sediments from sonic or seismic velocity data. We apply the model to sonic and VSP data from ODP Hole 995 and obtain hydrate concentration estimates from assumption (b) consistent with estimates obtained from resistivity, chlorinity and evolved gas data.
Collett T.
Dvorkin Jack
Helgerud Michael B.
Nur Amos
Sakai Akira
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