Determining residual oil saturation using carbon 14 labeled carbon dioxide

摘要

Residual oil saturation is determined by injecting an aqueous solution containing a carbonate salt, an acid-generating material and a radioactive material which are each selectively water soluble, displacing the solution with an aqueous solution devoid of the reactants and tracer, and, after CO.sub.2 has formed within the reservoir, producing aqueous fluid from the reservoir and utilizing radioactive analysis to measure the chromatographic separation between the radioactive material and the CO.sub.2.