XXX reported an input of 0.54 MJ/MJ crude oil extraction; this translates to 24.3 MJ energy input per kilogram crude oil extracted ( for energy value of 45 MJ/kg crude oil).
The life cycle energy efficiency for the production of natural gas is reported to be 21%; this can be translated to 11.34 MJ required for every kilogram of natural gas produced (for 54MJ/kg natural gas).