Ecological conditions for the distribution of methane producing bacteria in oil bearing strata of apsheron azerbaijan ssr ussr

Nazina, T.N.; Rozanova, E.P.

Mikrobiologiya 49(1): 123-129


ISSN/ISBN: 0026-3656
Accession: 005209917

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The distribution of methane producing bacteria was studied in oil bearing strata of the Apsheron Peninsula and depended on ecological conditions: the total mineralization of stratal water, the content of H2S, sulfates, pH and the extent of penetration of surface waters. The bacteria were found in 11 among 14 stratal water samples taken from the studied oil deposits. The flooding of oil collectors with surface waters was 1 of the factors responsible for the distribution of methane producing bacteria in the stratal waters of oil deposits. Methane producing cenoses were found in stratal water whose mineralization varied from 17 to 84. 8 g/l and the content of H2S varied from 0 to 585 mg/l. Most of the samples also contained sulfate reducing bacteria which grew in a medium with lactate, and fermenting microorganisms which grew in the presence of peptone and glucose and supplied methane producing bacteria with their substrates, namely, H2, CO2 and acetate. Preliminary experiments in which methane was produced from oil via a 2-stage process suggest that flooding favors the formation of oil oxidation products in the strata and these products serve as substrates for the growth of microbial cenoses producing methane.