Abstract
In the zone of diagenesis, which the author considers to be biochemical, intense biological activity of microorganisms generates a vast quantity of hydrocarbon gases. These gases are not dispersed, but are buried in the sediment, and form gas segregations even during the first stages of lithogenesis. The sediments in which the generation of hydrocarbon gases takes place have been separated as gas-producing deposits of diagenetic type. The hydrocarbon gases, which may be buried at great depths, are regarded as different subphases of catagenesis. The discovery of the burial of diagenetic gases is the theoretical basis for the exploration of gas segregations in shallowly buried sediments, and a reassessment of the prospects of gas occurrences in regions in which there is a thick sedimentary cover is unfavorable. 5 figures.
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