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Estimation of gas‐hydrate concentration and free‐gas saturation at the Norwegian‐Svalbard continental margin
Author(s) -
Carcione José M.,
Gei Davide,
Rossi Giuliana,
Madrussani Gianni
Publication year - 2005
Publication title -
geophysical prospecting
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.735
H-Index - 79
eISSN - 1365-2478
pISSN - 0016-8025
DOI - 10.1111/j.1365-2478.2005.00502.x
Subject(s) - geology , clathrate hydrate , saturation (graph theory) , continental margin , biot number , seismometer , mineralogy , hydrate , petrology , seismology , mechanics , tectonics , chemistry , mathematics , organic chemistry , combinatorics , physics
We estimate the concentration of gas hydrate and free gas at an area located to the north of the Knipovich Ridge (western Svalbard margin). The method is based on P‐wave velocities computed by reflection tomography applied to multicomponent ocean‐bottom seismometer data. The tomographic velocity field is fitted to theoretical velocities obtained from a poro‐elastic model based on a Biot‐type approach (the interaction between the rock frame, gas hydrate and fluid is modelled from first physical principles). We obtain average hydrate concentrations of 7% and maximum free‐gas saturations of 0.4% and 9%, depending on the saturation model.