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Study on Enhancing Oil Recovery by Indigenous Microorganisms in a Hypersalinity Reservoir

Abstract The feasibility of enhancing oil recovery in Qinghai oilfield with hypersalinity was studied. The results showed that main microbial populations in the reservoir were saprophytic, hydrocarbon-oxidizing, fermentative, nitrate-reducing bacteria and methanogens. The indigenous microorganisms preferentially used nitrogen sources for emulsification, the gas–liquid ratio was 0.20, pressure reached 0.27 MPa; saturated hydrocarbon was catalyzed selectivity. The species isolated were confirmed as Oceanobacillus sp. and Staphylococcus sp.; the oil recovery was 8.42%, which shows great potential to enhance oil recovery.