ABSTRACT: An Investigation of the Presence of Sulphate-Reducing Bacteria in Fluids of Devonian-age Oil Reservoirs, Southwestern Ontario, Canada
GARNER, NICOLI A., TSUJITA, CAMERON J., and KOVAL, SUSAN F., University of Western Ontario, London, Ontario, Canada
The relationship between sulphate-reducing bacteria and biofouling (H2S souring) of oil reservoirs is well known. However, the possible implications of this relationship in oil reservoirs of southwestern Ontario have not been investigated in any detail. In this study, we document the presence and inferred activities of sulphate-reducing bacteria within four petroleum reservoirs (Oil Springs, Petrolia, Rodney, and a new virgin pool near Rodney) hosted in Devonian strata of southwestern Ontario. These reservoirs were selected for study because they all exhibit some degree of souring, and share a number of characteristics known to be associated with biofouling by sulphate-reducing bacteria in oil pools outside of southwestern Ontario. These characteristics include a shallow subsurface location, a history of water-flooding practices, and high H2S concentrations. Microbiological assays conducted for this study detected the presence of sulphate-reducing bacteria in all four reservoirs. This justifies a thorough examination of microbial processes in oil reservoirs of southwestern Ontario.
Search and Discovery Article #90907©2000 AAPG Eastern Section Meeting, London, Ontario, Canada