Deploying the new Ora intelligent wireline formation testing platform enabled Petroleum Development Oman (PDO) to verify the cleanup of water-based mud (WBM) filtrate from similar-salinity formation fluid in an extremely low mobility reservoir transition zone for conducting accurate downhole fluid analysis. The ability to differentiate formation water from WBM filtrate with low resistivity contrast in the presence of oil made it possible to confidently place the station depth in the transition zone and accurately interpret contacts, saturation, and ultimately hydrocarbon in place.