The purpose experiments was to test the hypothesis of the attack of overheated water solutions saturated with carbon dioxide on kerogen-containing sandstones for formation of local rock deconsolidation and increasing the mobility of associated bitumoids. During experiments of the first series, samples of sandstones were saturated with a solution of predetermined mineralization and carbon dioxide, and underwent a pressure typical of a depth of 5000 m for 40 days. During the second series sandstone samples experienced pressure of 150 at and a temperature of 85 °C in the first stage and at a pressure of 500 at and T = 135 ° C - in the second stage (during 10 days each stage). After the hydrothermal influence at a pressure of 150 at and ?=85? ?, deconsolidation of rocks took place as well as the formation of additional void, the ?reation of additional quantities of authigenic kaolinite, quartz, albite, transition of associated bitumoids to the mobile state. After testing the open porosity of sandstones increased to 8.7-10.6%, i.e. reservoirs were transferred to the rank of commercial. The obtained results are important in the development of methods for increasing of oil recovery enhancement in the extraction of heavy high-viscosity oils.