Related by context. Frequent words. (Click for all words.) 73 shale formations 71 shale 66 shale gas 62 hydrocarbon reserves 61 shales 58 horizontal drilling 57 Marcellus shale 57 Marcellus Shale formation 56 coal seams 56 tar sands 55 coalbed methane 54 hydrocarbons 54 Shale 54 oil sands 53 hydrocarbon 53 trillion cubic feet 53 natural gas 52 geological formations 52 Marcellus Shale 50 coal seam 50 drillers 50 recoverable reserves 49 Williston Basin 49 drilling 49 Appalachian Basin 49 Haynesville Shale 48 Piceance Basin 48 Barnett Shale 48 outer continental shelf 48 hydraulic fracturing 47 fracking 47 mineral resources 47 oilfields 47 Outer Continental Shelf 47 directional drilling 47 Fracking 47 tcf 47 geothermal 46 Geothermal 46 geologically 46 Petroleum Reserve 46 ANWR 46 gas condensate 46 basins 46 Montney 45 aquifers 45 Tcf 45 Fayetteville Shale 45 Bakken 45 exploratory drilling 45 coal gasification 45 trillion cubic meters 44 exploration 44 Drilling 44 Alberta oilsands 44 oil 44 rock formations 43 rare earths 43 horizontal wells 43 wells drilled 43 Ford Shale 43 Roan Plateau 43 fossil fuels 43 Powder River Basin 43 bitumen 43 geological 43 Marcellus 43 coal 43 deepwater exploration 43 oilsands 43 gas 43 uranium mines 43 carbon sequestration 42 mineral 42 bed methane 42 probable reserves 42 coal seam gas 42 Carbon Capture 42 EOR 42 IOCs 42 placer gold 42 drilling fluids 42 minerals 42 carbon capture 42 methane 42 acreage 42 shallow depths 42 uranium 42 Earth crust 42 deepwater 41 reservoirs 41 deepwater Gulf 41 Santos Basin 41 mineral deposits 41 Oil Sands 41 potash 41 Hydrocarbons 41 Kovykta 41 reserves 41 Haynesville 41 wells