| In this study,the shale samples were obtained from eastern Qaidam area.In the depth of938.5m and 1035.4m,two shale samples were taken to carry out the analysis of the mineral composition and the microscopic pore structure analysis.The greenhouse gas adsorption experiment used the gas solid two phase adsorption apparatus designed by the project group.The isothermal adsorption experiments were carried out according to the gas isothermal adsorption volume method at different temperature.The adsorption quantity of pure methane gas is calculated according to the conservation of material and the equation of gas state.The factors affecting shale adsorption of greenhouse gases include temperature,pressure,organic matter content,pore structure,clay content and thermal maturity.The experimental results show that the adsorption capacity of greenhouse gases increases with the increase of pressure;the more organic matter content,the greater the adsorption capacity of gas;in shale samples,the characteristics of the mixed gas adsorption are similar to the methane adsorption characteristics,and the adsorption machine is similar to the adsorption machine.It is the same.Although the pore volume of micropores is very small,the specific surface area of the micropores is the largest,and the amount of methane adsorption is closely related to the micropore,and the TOC content is closely related to the pore structure of the shale,especially in the medium and micro pores.The higher the content of TOC,the greater the adsorption.Micropore is the main contributor to the specific surface area of shale,and the amount of adsorption increases with the increase of specific surface area. |
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