It is of great significance to quantitatively study the permeability of oil shale and its variation during in situ pyrolysis, which can be used to predict the hydrogeological environment changes induced by the in situ pyrolysis process. Since oil shale permeability during in situ pyrolysis cannot be directly measured in real time, a systematic analysis of pyrolysis kinetics and mechanism, combined with thermogravimetric experiments, allow a constitutive model of the porosity and elastic modulus of oil shale to be deduced. In analyzing the stress and strain mechanism of oil shale under in situ conditions, combined with the quantitative relationship between porosity and permeability, a constitutive permeability model of oil shale during in situ pyrolysis was established. Meanwhile, the predicted variation of oil shale permeability during in situ pyrolysis was compared with experimental results.
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