Research on the Abnormal Isothermal Adsorption of Shale
2015
Li, Teng | Wu, Caifang
The adsorption content of the shale sample and pure clay minerals decreased at a high pressure and clearly declined for pure clay minerals. With the increase in the test pressure, the degree of deviation between the gaseous phase CH₄ density increment rate and the adsorbed phase CH₄ mass increment rate decreased, which resulted in a decrease in the methane adsorption values calculated at a high pressure. As the test pressure increased, the measurement volume of the shale sample and the pure clay minerals decreased. In the adsorption measurement, the diameter of CH₄ is larger than that of He, with the development of the micropores in shale; the actual measurement volume was larger compared to that in the buoyancy measurement. Accompanied by the increase in the test pressure and adsorption, the volume of the adsorbed phase CH₄ should also be considered in the calculation performed in the adsorption measurement. All of these factors have reinforced the calculated degree of reduction of methane adsorption at a high pressure. Besides the adsorption capacities of different pure clay minerals being different, the content and types of pure clay minerals also affected the adsorption capacity of shale at a high pressure.
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