Log-Derived Residual Oil Saturation A Look at Basin Concepts and Field Case Studies

Log-derived determination of residual oil saturation (ROS) for enhanced oil recovery projects requires accurate and reliable techniques. Therefore, special considerations have to be given to both the logging operation and associated interpretation methods. Since the statistical uncertainty limits of conventional open - and cased - hole logging techniques are not sufficient for reliable ROS values, a key parameter in the evaluation of EOR candidates, several log-inject-log (LIL) techniques based on multiple repeat logging runs are available to provide more reliable ROS values. Advantages and possible constraints of several LIL techniques will be discussed.