Related by context. Frequent words. (Click for all words.) 69 methane hydrate 64 gas hydrates 63 methane hydrates 61 mud volcanoes 61 sedimentary basins 61 hydrocarbon reserves 61 geological formations 60 seabeds 59 hydrocarbons 58 gasfields 57 subsurface 57 hydrocarbon 57 geologic formations 56 clathrates 56 Lake Vostok 56 carbonate reservoirs 55 reservoir sands 55 seabed 55 salt domes 55 sandstone reservoirs 54 volcanic vents 54 hydrothermal activity 54 microfossils 53 underwater volcanoes 53 Tar sands 52 lavas 52 magma chamber 52 gasfield 52 technically recoverable 52 condensates 52 geologically 52 geological 52 Arctic permafrost 52 marine sediments 52 depositional 52 shale deposits 52 hydrothermal vents 52 plankton blooms 51 Kaskida 51 tubeworms 51 gas condensate 51 hydrothermal vent 51 Yamal Peninsula 51 peridotite 50 kerogen 50 sediments 50 deepwater discoveries 50 porosities 50 basins 50 sedimentary basin 50 liquid hydrocarbons 50 sandstone formations 50 Geochemistry 50 placer deposits 50 continental crust 50 deplete oxygen 50 biota 50 Mexico GOM 50 sedimentary rock 49 Lower Cretaceous 49 atmospheric methane 49 Gippsland Basin 49 recoverable reserves 49 CO2 sequestration 49 economically recoverable 49 igneous rocks 49 Lower Tertiary 49 coal seams 49 regasification terminals 49 hydrological cycle 49 drillings 49 Tindalo 49 hydrocarbon bearing 49 commercially recoverable 49 subduction zones 49 Celebes Sea 49 zircons 48 alluvial diamonds 48 geologic formation 48 Carbonates 48 rock formations 48 methane 48 reservoir characterization 48 Snohvit 48 geologic 48 isotopic composition 48 shale formations 48 reservoir 48 shales 48 undersea plumes 48 tcf 48 Tcf 48 upwellings 48 condensate 48 natural gas 48 Barnett Shale formation 48 Natuna 48 Siberian permafrost 48 trillion cubic meters 48 groundwater aquifers 48 phytoplankton blooms