Microbial processes in the Savuiskoe oil field in the Ob` region
- Institute of Microbiology, Moscow (Russian Federation)
Ecotopes of a terrigenous stratum of the Savuiskoe oil field flooded with coproduced water, having a temperature of 35{degrees}C and devoid of dissolved O{sub 2}, H{sub 2}S, and SO{sup 2-}{sub 4}, were studied. The stratal water was of a chloride-calcium type, had a mineralization value of 11-17 g/l, and contained 2-138 mg SO{sup 2-}{sub 4}/l but no H{sub 2}S. the near-bottom zones of two injection wells investigated had a temperature of 37-42{degrees}C (type 1 ecotopes); the temperature of the stratal water in the area of producing wells (type 2 ecotopes) was greater than 60{degrees}C. In stratal waters, sulfate-reducing and methanogenic bacteria prevailed. In the water of type 2 ecotopes, the rate of thermophilic sulfate reduction (measured by the radioisotope method) was lower, and that of methanogenesis was higher than the corresponding rates of mesophilic processes in type 1 ecotopes. The share of acetate-derived carbon in the biogenic methane in the water of producing wells was as low as 2-10%. The possible sources of organic matter consumed in the anaerobic processes in the strata and the reasons for the predominance of bicarbonate carbon in the biogenic methane are discussed. 14 refs., 7 figs.
- OSTI ID:
- 70299
- Journal Information:
- Microbiology (New York), Vol. 64, Issue 1; Other Information: PBD: Jan-Feb 1995; TN: Translated from Mikrobiologiya; 64: No. 1, 104-111(1995)
- Country of Publication:
- United States
- Language:
- English
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