Physics – Geophysics
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3123310t&link_type=abstract
Geophysical Research Letters, Volume 31, Issue 23, CiteID L23310
Physics
Geophysics
20
Exploration Geophysics: Downhole Methods, Exploration Geophysics: Seismic Methods (3025), Physical Properties Of Rocks: Permeability And Porosity, Tectonophysics: Physics Of Magma And Magma Bodies
Scientific paper
Log and core data document gas saturations as high as 90% in a coarse-grained turbidite sequence beneath the gas hydrate stability zone (GHSZ) at south Hydrate Ridge, in the Cascadia accretionary complex. The geometry of this gas-saturated bed is defined by a strong, negative-polarity reflection in 3D seismic data. Because of the gas buoyancy, gas pressure equals or exceeds the overburden stress immediately beneath the GHSZ at the summit. We conclude that gas is focused into the coarse-grained sequence from a large volume of the accretionary complex and is trapped until high gas pressure forces the gas to migrate through the GHSZ to seafloor vents. This focused flow provides methane to the GHSZ in excess of its proportion in gas hydrate, thus providing a mechanism to explain the observed coexistence of massive gas hydrate, saline pore water and free gas near the summit.
Bangs Nathan L.
Chevallier Johanna
Flemings Peter B.
Gràcia Eulàlia
Johnson Joel E.
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