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Oil Field unit for natural gas volume: 1 boe = 6,000 bbl 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 bbl ft3 in volumetric terms.
See also
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Natural Science / Engineering / Measurement / Unit
[ Tonne of oil equivalent (TOEOil Equivalent (TOE) ][ Gas Oil Equivalent (GOE) ]
[ Oil barrel (bbl) ]
6,000 cubic feet (170 cubic metres