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Thevalueofafuel'slong-termusefulnessandviabilityisjudgedthroughitsenergyreturnoninvestment;parisonbetweentheeventualfuelandtheenergyinvestedtocreateit.Theenergyreturnoninvestment(EROI)studypublishedintheJournalofIndustrialEcologyfindsthat shale(页岩) gashasareturnvaluewhichisclosetocoal.IntheUnitedStates,gasisminedfromhorizontal,hydraulicallyfracturedwellsintheMarcellusShaleofPennsylvania.paresthetotalinputenergywiththeenergyexpectedtobemadeavailabletoendusers. TheanalysisindicatesthattheEROIratioofatypicalwellislikelybetween64:1and112:1,withameanofapproximately85:1.Thisrangeassumesanestimatedultimaterecovery(EUR)of3.0billioncubicfeetperwell.ThisissimilartotheEURofcoal,whichfallsbetween50:1and85:1. "Ouranalysisindicatesthatgascanbeextractedfromshaleefficiently,fromanenergyperspective.Theenergyreturnon(energy)investmentratio(EROI)doesseemtobeatleastasfavorableascoal,"saidleadauthorMikeAucott."However,acomparisonwithcoalisdifficult.Thereappeartobelargeamountsofcoalstillavailable.Estimatesoftheamountofgasavailablefromtheshaleplaysvarywidely.Itisnotclearyetwhetherthereisanywherenearenoughtorivalcoaloverthelonghaul." "Thereareconcernsaboutwaterpollutionandotherenvironmentalimpactsassociatedwithshalegasproduction,"concludedAucott."Withtheassumptionthatthesecanbemanaged,andthatproductionquantitiesremainconsistentwithinitialproductiondata,thefavorableEROIsuggeststhatshal 内容来自淘豆网www.taodocs.com转载请标明出处.