Concentrating on the characteristics of the oil shale resources in China. Jilin University put forward the concept of using sub-critical water as a heat transfer medium and extractant to the in-situ conversion of oil shale. This paper studied the change of the permeability of oil shale during the sub-critical water extraction. A physical model was proposed to simulate the in-situ extraction of oil shale by sub-critical water. THM coupling mathematical model was established to get control of computer simulation. Results showed that with the release of organic matter, the internal crack of oil shale was gradually expanding and the seepage passage was opened. The permeability of oil shale was then increasing at the same time. The result of the calculation showed that the permeability of oil shale increased with the increasing of the extraction time, the temperature and the pore pressure and with the decreasing of the volume stress. In addition, we expect to get the relationship between permeability coefficient k_i and temperature, pressure, volume stress, pore pressure and other parameters to reflect the influence of external force on the oil shale permeability combined with the experimental data.
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