Page 130 - Geology and Geochemistry of Oil and Gas

TABLE 6.1 102

Composition of natural gases
Component Type of gas field Natural gas separated from crude oil
Dry gas, Los Medanos, Sour gas, Jumping Gas-condensate, Paloma, Ventura, California
California (mol%) Pound, Canada (mol%) California (mol%)

400 lb (mol%) 50 lb (mol%) Vapor (mol%)
Hydrogen sulfide 0 3.3 0 0 0 0
Carbon dioxide 0 6.7 0.68 0.30 0.68 0.81
Nitrogen and air 0.8 0 0 0 0 2.16
Methane 95.8 84.0 74.55 89.57 81.81 69.08
Ethane 2.9 3.6 8.28 4.65 5.84 5.07
Propane 0.4 1.0 4.74 3.60 6.46 8.76
Isobutane 0.1 0.3 0.89 0.52 0.92 2.14
n-Butane trace 0.4 1.93 0.90 2.26 5.02 NATURAL
Isopentane 0 0 0.75 0.19 0.50 1.42
n-Pentane 0 0 0.63 0.12 0.48 1.41
Hexane 0 0.7 1.25 0 0 0
Heptane 0 0 0 1.05 1.05 4.13 GASES
Octane 0 0 6.30 0 0 0
Nonane 0 0 0 0 0 0
Total 100 100 100 100 100 100 AND
Separator pressure in psi (pounds per square inch). CONDENSATES