Geochemistry of water-dissolved gases of oil-and-gas bearing deposits in the southern areas of Ob-Irtysh interfluve

The article presents the results of the studies of the geochemical features of water-dissolved gases in the oil and gas bearing deposits in the southern areas of Ob-Irtysh interfluve. An increase in the total groundwater gas saturation with an increase in depth was established, from 0,1–0,5 l/l in the Aptian-Albian-Cenomanian water-bearing complex to 3,0–3,5 l/l in the Lower and Middle Jurassic one. Methane is the most widespread gas in the waters, its concentration in water increases with depth down to 2 000–2 200 m, and deeper its concentration decreases within the depth range 2 400–2 500 m. Here a peak of the concentrations of its homologues was revealed (C2H6; C3H8; iC4H10; nC4H10; iC5H12; nC5H12; iC6H14; nC6H14). This kind of the vertical zoning is connected with the distribution of the deposits of hydrocarbons. Within the depth range of 2 600–2 700 m, a peak of carbon dioxide concentrations was detected. In some areas, gases with anomalous CO2 concentrations (up to 96 %) are widespread. The concentrations of nitrogen and helium regularly decrease with depth.

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