Related by context. Frequent words. (Click for all words.) 75 Marcellus Shale formation 73 Marcellus shale 70 Marcellus Shale 59 shale deposits 58 Marcellus Shale drilling 58 shale formations 57 Utica Shale 57 Bakken formation 56 shale 56 drillers 56 Marcellus 55 shale gas 55 Bakken Formation 54 hydrofracking 54 natural gas 53 coal seams 53 Ogallala Aquifer 53 Barnett shale 53 coalbed methane 53 Barnett Shale 52 fracking 52 Bakken shale 52 coal seam 52 aquifers 51 hydraulic fracturing 51 Fracking 51 Haynesville Shale 51 Appalachian Basin 51 horizontal drilling 51 Woodford Shale 50 anthracite coal 50 geologic formations 50 underground aquifer 50 Albany Shale 50 Roan Plateau 50 bed methane 49 unconventional shale 49 undeveloped acreage 49 Fayetteville Shale 49 geological formations 48 drilling 48 Haynesville shale 48 underground aquifers 48 undrilled 48 coalbed methane CBM 47 St. Lawrence Lowlands 47 CNX Gas 47 Uinta Basin 47 subsalt 47 geologically 47 mine subsidence 47 aquifer 47 Powder River Basin 47 sedimentary basin 46 reservoir 46 shales 46 Comstock Lode 46 Otero Mesa 46 underground caverns 46 salt caverns 45 Pinedale Anticline 45 Shale Gas 45 Galilee Basin 45 wells 45 Bakken Shale 45 groundwater 45 Orinoco Belt 45 unpatented claims 45 hydrocarbon reserves 44 Range Resources 44 coal seam gas 44 rock formations 44 northeastern Pennsylvania 44 Niobrara 44 trillion cubic feet 44 Shale 44 Hydraulic fracturing 44 Lease Sale 44 contaminated groundwater 44 sedimentary rock 44 wells drilled 44 Coal Bed Methane 43 Chicontepec 43 Piceance Basin 43 horizontal wells 43 Anticline 43 Alaska Prudhoe Bay 43 gas 43 Surat Basin 43 Alberta tar sands 43 undeveloped 43 Three Forks Sanish 43 Mon Fayette Expressway 43 sedimentary basins 43 Marcellus Shale Coalition 43 reservoirs 43 wellfield 43 Pennsylvania 43 acreage 43 exploratory drilling 43 Columbia Gas Transmission