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 4. Frequency distribution of sum of methane homologs in deposits of different types, from analyses and classification of 3,500 worldwide reservoired gases (after Nikonov, 1971)