Light Hydrocarbons for Petroleum and Gas Prospecting
V.T. Jones, III, M.D. Matthews and D.M. Richers
Geochemical Remote Sensing of the Subsurface.  Edited by M.Hale
Handbook of Exploration Geochemistry, Vol. 7 (G.J.S. Govett, Editor)
©1999 Elsevier Science B.V. All rights reserved
Preprint


TABLE 5-XI

Comparison of results of free soil gas and disaggregated soil gas surveys, Rosehill, Virginia (Richers, 1984)

Survey method

No. of sites

% methane

C1/C2

1000 x C3/C1

Free soil gas

145

72

7

110

Disaggregated gas

128

70

7

117