According to the BP annual report (available for free on BP's site) by the year 2030 oil production will be down one third because one third of the oil reserves (by volume) have reserves/production ratios lower than 15 years including the US. Mexico for instance could stop exporting oil in 3 years and run out of oil in just 10 years.
There will be plenty of nat gas and coal for the rest of the century. There is probably more coal on earth than enough atmospheric oxygen to burn it.