The largest unconventional crude oil resources are found in heavy oil and shale reservoirs. Thermal recovery methods have been developed to enhance oil recovery, yet there is limited research on supercritical fluid (SCF) injection in shale formations like the Bazhen formation (< 0.01 mD). This study examines the impact of thermochemical treatment on the Bazhen formation in Western Siberia using horizontal wells with hydraulic fractures. The hydrocarbon composition of these deposits includes light mobile hydrocarbons and significant heavy stationary fractions—bitumen and kerogen. High temperatures (>250 °C–300 °C) can convert these fractions into mobile oil, extractable through conventional methods. The proposed method involves cyclic injection of supercritical water above 450 °C to achieve high-temperature exposure of kerogen and bitumen within the formations. A comprehensive approach, combining laboratory tests and simulation modeling, was adopted to evaluate this enhanced oil recovery method. An optimal simulator described the filtration in porous media and the chemical reactions between hydrocarbons and high-temperature fluids. Numerical experiments determined the optimal computational grid for simulating the processes during cyclic injection and extraction, identifying optimal injection cycles for significant technological impact. Core material analysis provided distributions of parameters such as permeability, porosity, thermal conductivity, heat capacity, and organic content. A probabilistic model and Monte Carlo simulations assessed uncertainty and parameter impact on cumulative oil production. The study also explored catalytic options to accelerate reaction rates, potentially improving the efficiency and economic viability of the process. Field testing is under review following laboratory experiments and simulations. The field data obtained will be used for history-matching and advanced simulations to scale the technology across the entire oilfield.