cement authigenic carbonates / sedimentation deuterium gas hydrates / n-butane gas hydrates / isopentane gas hydrates / natural gas gas hydrates / gas-collection chambers / gas fields / methane/ethane ratio gas hydrates / marine gas hydrates / isobutane/n-butane ratio n-heptane gas hydrates / gas hydrates acoustic velocity / gas volume / geochronology carbon dioxide gas hydrates / gas composition / paleoproductivity propane gas hydrate occurring zone / gas/water volume ratio / gas-hydrate / cement cement / deuterium hydrogen sulfide gas venting / hydrate gas vs. sediment gas / chlorinity gas hydrates / gas sources / dipole shear tool / water/gas molar ratio gases / vs. gas volume / kerogen gas hydrate occurring zone / bromide gas hydrates / natural gas / isobutane gas hydrates / gas hydrate detection / gas hydrate occurring zone / n-pentane gas hydrates / carbonate cement / gas voids / ethane gas hydrate occurring zone / cement / gas release / gas-hydrate estimates / gas hydrates / gas composition collection chambers / carbon/oxygen ratio gas hydrates / fractionation gas hydrates / gas venting / gas field / gas hydrate concentration estimate / propane ratio gas hydrates / shear wave velocity gas hydrates / gas volume collection chambers / fluid flow gas hydrates / /