Key words: statistical analysis core, surface wettability, hydrophobic, hydrophilic, disjoining pressure, ion activity.
On a representative statistical material the author analyzed the influence of formation waters chemical composition on the wettability of the productive rocks. Wettability of the cores was determined by the productive objects OST 39-180-85. To explain the experimental evidence used coagulation DLVO theory. Wettability alteration in the hydrophobic side is due to the destruction of the water film. Stability of the film depends on salinity, pH and the specific activity of positive and negative ions. Found that divalent metal ions and non-chlorine and bromine reduced stability of the water film and the ions are anions may manifest itself as stabilizers, and water layer destructors.
