Related by context. Frequent words. (Click for all words.) 58 groundwater aquifers 57 subsurface 56 subglacial 54 aquifers 54 injection wells 54 Aquifers 53 wellfields 53 hydrothermal fluids 53 shallow aquifer 53 geologic formations 53 surface geochemistry 53 sandstone reservoir 53 sulphide deposits 53 uraniferous 53 peridotite 52 sandstone reservoirs 52 methane 52 Marcellus shale formation 52 magma chamber 52 Chattanooga Shale 52 diatomite 52 sulfide minerals 52 reservoirs 52 reservoir 52 Coalbed methane 52 clastic 51 drainage basins 51 basins 51 sediments 51 placer deposits 51 wellbores 51 Lower Cretaceous 51 subcrop 51 copper sulphide 51 sediment 51 Horizontal drilling 50 andesitic 50 geological formations 50 recharge groundwater 50 marine sediments 50 dewater 50 coalbed methane wells 50 alluvial deposits 50 diamondiferous kimberlite 50 depositional 50 coal seams 50 Upper Jurassic 50 frac sand 50 salars 50 mud volcanoes 50 Cluff Lake 50 Barnett Shale formation 50 geochemically anomalous 50 brines 50 embayment 50 Geophysical Surveys 49 stockwork veining 49 magmas 49 biogeochemical 49 groundwater 49 hydrogeological 49 gossanous 49 Floridan Aquifer 49 Lower Tertiary 49 miscible 49 Paradox Basin 49 gabbroic 49 Bakken shale formation 49 methane gas 49 Marmaton 49 carbonate reservoirs 49 kimberlitic 49 Merensky 49 methane hydrates 49 underground aquifers 49 Nikanassin 49 Ogallala aquifer 49 Geochemistry 49 salt domes 49 wells 49 sandstones 48 porosities 48 gravity anomalies 48 frac fluid 48 clathrates 48 granitic rocks 48 downdip 48 Appalachian basin 48 geologic formation 48 Three Gorges reservoir 48 Leachate 48 shallower depths 48 tungsten mineralization 48 Pulacayo 48 Raton Basin 48 unmineralized 48 acid leaching 48 methane CH4 48 uphole 48 microseismic 48 carbonate minerals