It is convenient to account for both oil and gas in terms of the energy equivalent of a barrel of oil, although actual North Sea oil production has fallen from just above 3 million bpd in1979 to just over one million bpd now.
Meanwhile, the energy for everything else--offices, factories, homes and data centers is 85% supplied without oil, and most of it is delivered as kilowatt-hours. (Only a vanishingly 2% of electricity is generated by oil.) Once you connect automobiles to the electric grid, you access a trillion-barrel-of-oil-equivalent energy infrastructure almost entirely fueled by domestic sources: coal, uranium, natural gas and hydro dams.