Predictions of Oil or Gas Potential by Near-Surface Geochemistry

V.T. Jones and R.J. Drozd The American Association of Petroleum Geologists Bulletin V.67, No. 6 (June 1983), P.932-952

Figure 2.  Comparison of standard chromatograms [all components at 1 ppm (v/v)] with typical soil-gas chromatograms, San Joaquin basin.  Output from log scale integrator