Raw natural gas hasnt been refined seperating butane propane and other
gasses. Raw natural gas s indeed used directly in peoples homes, know a
fellow with a abandoned oil well on his property, ewhen they quit
pumping it he paid some $ to leave the casing and heats his home and
water with gas from this well, its at 5 PSI reportedly high for butler
PA area.

since raw natural gas contains other gasses it has slightly more BTUs
than refined gas.