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Can We Estimate the Amount of Gas Hydrates by Seismic Methods?
Author(s) -
SAKAI AKIO
Publication year - 2000
Publication title -
annals of the new york academy of sciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.712
H-Index - 248
eISSN - 1749-6632
pISSN - 0077-8923
DOI - 10.1111/j.1749-6632.2000.tb06792.x
Subject(s) - clathrate hydrate , cementation (geology) , saturation (graph theory) , hydrate , geology , mineralogy , sediment , characterisation of pore space in soil , water saturation , geotechnical engineering , mechanics , chemistry , porosity , materials science , geomorphology , composite material , physics , mathematics , organic chemistry , combinatorics , cement
A bstract : Elastic wave velocity is the key parameter in determining the quantity of gas hydrate in sediment. Using data acquired in permafrost, elastic responses of gas hydrate bearing sediment are examined in detail by fitting observed elastic wave velocities of VSP and logging data with computed velocities based on two opposing gas hydrate bearing models. It is concluded that observed elastic wave velocity best fits a model of gas hydrate disseminated in pore space, without assuming cementation on grain boundaries in model simulations. This conclusion is important in the sense that shear wave velocity is crucial in determining gas hydrate bearing model and estimating gas hydrate saturation rate in pore space. The current case is the first example in model determination by reliable elastic wave velocity observed in the field.