Predictions of Oil or Gas Potential by Near-Surface Geochemistry
V.T. Jones and R.J. DrozdThe American Association of Petroleum Geologists Bulletin V.67, No. 6 (June 1983), P.932-952

Table 1.  Empirically Determined Composition Range for Soil-Gas Hydrocarbons over Different Reservoir Types 

 

C1/∑Cn

C1/C2

(C3/C1) x 1,000

 

 

 

 

Dry Gas

100-95

100-20

2-20

Gas Condensate or Oil and Gas

95-75

20-10

20-60

Oil

5-50

10-4

60-500