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Methane isothermal adsorption experiment is the main means of evaluating the adsorption capacity of shale, and according to the national standard GB/T 35210.1-2017 Method for Determination of Isothermal Adsorption of Methane from Shale Part 1: Volumetric Method, a high-pressure isothermal adsorption instrument was used to determine the excess adsorption amount of shale, with the highest pressure up to 69 MPa.

The shale absolute adsorption curve was calculated by fitting the experimental data according to the modified Langmuir model considering the volume of the adsorbed phase, and obtaining the Langmuir volume, Langmuir pressure and adsorbed phase density parameters.

The methane isothermal adsorption test under different temperature conditions was used to establish the adsorption model under temperature and pressure conditions and evaluate the adsorption capacity of the samples under the temperature and pressure conditions of the formation; the methane isothermal adsorption test of the samples with different TOC contents was used to study the effect of organic matter on the adsorption capacity of shale; the methane isothermal adsorption test of the samples with different water content was used to evaluate the effect of water on the adsorption capacity of shale. The shale methane adsorption parameters are important basic parameters for the estimation of shale gas content and the study of shale gas flow behavior.