Determining residual oil saturation following flooding

摘要

A method for determining the fluid saturation, for example the hydrocarbon saturation, the residual oil saturation or water saturation, of a reservoir following a secondary recovery operation wherein there is injected into the reservoir via a well first hydrocarbons and then a secondary recovery medium to return the portion of the reservoir in the immediate vicinity of the well to the same fluid saturation as exists in the bulk of the reservoir. The reservoir is then logged with a logging instrument to determine the hydrocarbon saturation, gas saturation, residual oil and/or water saturation.