Related by context. Frequent words. (Click for all words.) 73 shale 68 shale gas 65 shale formations 62 coal seams 62 sandstones 61 Shale 61 shale deposits 60 geologically 60 Haynesville shale 60 Woodford Shale 59 sedimentary rocks 59 geological formations 59 Bakken formation 56 Granite Wash 56 Appalachian Basin 56 coalbed methane 56 sedimentary 56 undrilled 55 sedimentary rock 55 Marcellus shale 55 Haynesville Shale 55 horizontal drilling 54 stratigraphic 54 carbonates 54 Miocene 54 Austin Chalk 54 Williston Basin 53 hydrocarbons 53 Bakken Shale 53 Haynesville 53 Montney 53 dolomite 53 hydrocarbon 52 sands 52 Devonian 52 Triassic 52 coal seam 52 stratigraphy 52 granites 52 horizontal wells 51 shallow depths 51 Fayetteville Shale 51 Barnett Shale 51 carbonate 51 sediments 51 gas condensate 51 Eocene 51 wells drilled 51 volcanics 50 rock formations 50 Cretaceous 50 Deep Basin 50 geologic 50 Shales 50 brines 50 sulphides 49 gabbro 49 hydrocarbon bearing 49 geological 49 uranium mineralization 49 hydrocarbon reserves 49 mafic 49 Marcellus Shale 49 fracture stimulation 49 mineable 48 basins 48 lithologies 48 polymetallic 48 recoverable reserves 48 recompletion 48 Piceance Basin 48 geology 47 waterflood 47 pegmatite 47 Coal Bed Methane 47 wellbore 47 gas hydrates 47 prospectivity 47 Formation 47 basalt 47 natural gas 47 Archean 47 gravels 47 volcanic rocks 46 Ford Shale 46 ultramafic 46 Mississippian 46 underexplored 46 bituminous coal 46 schist 46 hydrothermal 46 frac 46 Carlin Trend 46 EOR 46 sandstone 46 shear zones 46 drilling 46 unconformity 46 wells 46 epithermal 46 molybdenum