Related by context. Frequent words. (Click for all words.) 73 shale deposits 72 shale 66 shale gas 65 shales 63 horizontal drilling 61 Marcellus Shale formation 59 Marcellus shale 58 geological formations 58 coal seams 58 hydraulic fracturing 56 Marcellus Shale 56 fracking 54 drillers 54 coalbed methane 53 Haynesville Shale 53 rock formations 53 Barnett Shale 53 Fayetteville Shale 52 coal seam 51 Appalachian Basin 51 Shale 51 hydrocarbon reserves 51 oil sands 50 natural gas 49 tar sands 48 hydrocarbon 48 trillion cubic feet 48 horizontal wells 48 Fracking 48 Williston Basin 47 wellbore 47 hydrocarbons 47 aquifers 47 Piceance Basin 46 wells drilled 46 hydrofracking 46 coal seam gas 46 directional drilling 46 wells 45 Haynesville 45 drilling fluids 45 drilling 45 Montney 45 Marcellus 45 Granite Wash 44 geologically 44 gas condensate 44 frac 43 recoverable reserves 43 fracture stimulation 43 outer continental shelf 43 oil 43 methane 42 reservoirs 42 tcf 42 basins 42 Tcf 42 underground aquifers 42 EOR 42 ANWR 42 Outer Continental Shelf 41 oilsands 41 Ford Shale 41 bcf 41 bed methane 41 Powder River Basin 41 mmcf d 41 Alberta oilsands 41 subsurface 41 Oil Sands 40 Roan Plateau 40 Bakken 40 recompletion 40 Natural gas 40 drilling rigs 40 reservoir 39 oilfields 39 bbls 39 XTO Energy Inc. 39 caverns 39 trillion cubic meters 39 Earth crust 39 sedimentary rocks 39 Bcf 39 XTO 39 acreage 39 gas 39 Drilling 39 deepwater 38 methane gas 38 carbon dioxide 38 MMcf 38 Petroleum Reserve 38 liquids 38 Encana 38 BOPD 38 exploratory drilling 38 coal 38 uranium 38 Keystone XL 38 MMcfd