Oil saturated specimens of Stevns outcrop chalk were tested in a standard Hoek cell. The test programme included uniaxial strain and waterflooding. The waterflooding test results lead to the conclusion that above the yield stress level the Stevns chalk compacts due to waterflooding. Strain gauges measurements in 3 levels on the specimen indicated that the waterflooding may be characterized as a plug flow and local compaction due to waterflooding was recorded. SEM studies showed no significant signs of cementation due to specimen preparation before testing.