Pentane
Hexane
CH4
80–95%
C2H6
2.5–7%
C3H8
1–3%
C4H10
1–3%
C5H12
trace
C6H14
trace
Nonhydrocarbon gases
Carbon dioxide
Nitrogen
Hydrogen sulfide
Water vapor
Helium
CO2
1–2%
N (or N2) 1–4%
H2 S
variable
H2 O
variable
He
trace
70. Peebles, M.W.H., 1980, Evolution of the Gas Industry: New York, New
York University Press, 235 p.
71. Energy Information Administration Office of Energy Markets and End
Use, 2009, Annual Energy Review…
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