Oil Field unit for natural gas volume: 1 boe = 6,000 ft3 = 170 m3
The above is the USGS convention.
The alternative convention is provided by U.S. Internal Revenue Service as : 1 boe = 5.8 · 106 btu in energy terms which is equivalent to 1 boe = 5,800 ft3 in volumetric terms.
See also
Natural Science / Engineering / Measurement / Unit
[ Tonne of Oil Equivalent (TOE) ][ Gas Oil Equivalent (GOE) ]
[ Oil barrel (bbl) ]
6,000 cubic feet (170 cubic metres