The laboratory experiments were carried out to investigate the influence of vibration on the<br>process of capillary imbibition of rocks (core of oil reservoirs). The cores of sand oil-filled reservoir were<br>studied. The capillary imbibition of cylindrical cores have direction from lower end of core which contacted<br>with water. The curves of capillary imbibbition were determined by the method of continuous weighing. The<br>curves of imbibition were approximated by power functions f (t) ! t a but the index a was equal to 0.35-<br>0.42 rather then 0.5 (theoretical value). The average value of capillary conductivity – 1-2⋅10-8 m2/s. Vibration<br>with frequency of 10-40 Hz and magnitude of 0.1-0.5 mm leads to increase of the capillary conductivity by<br>15-25 %. We suppose that the influence of vibration is connected with changes of wettability of rocks.