Experimental Study on the Methane Adsorption of Massive Shale Considering the Effective Stress and the Participation of Nanopores of Varying Sizes.

For free gas, due to the compressibility of pore volume, with the increase of burial depth, the in situ stress is dominant in the effective stress relative to pore pressure, resulting in the storage space of free gas gradually decreasing with the increase of burial depth, and then leading to the reduction of free gas content. In comparison to the average pore size calculation method, the analysis of the PSD reveals that the content of adsorbed gas does not exhibit a decreasing trend with the increasing burial depth.

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