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通过简化局部密度(SLD)理论预测了川南地区龙马溪组页岩样品在25℃、35℃、45℃下的等温吸附曲线。研究表明:SLD理论可以有效拟合绿泥石、伊利石、伊/蒙混层及Ⅱ型干酪根的等温吸附曲线,而且在同一种物质的各回归参数中仅能量参数εgs随温度变化,一旦确定εgs与温度的关系,就可借助SLD理论用已知温度下的等温吸附曲线计算出另一温度下的等温吸附曲线;预测的页岩等温吸附曲线与实验获取的等温吸附曲线误差较小。
The isothermal adsorption curves of shale samples of Longmaxi Formation in South Sichuan at 25 ℃, 35 ℃ and 45 ℃ are predicted by the simplified local density (SLD) theory. The results show that the SLD theory can effectively fit the isothermal adsorption curves of chlorite, illite, Iraqi mixed layer and type II kerogen, and only the energy parameter εgs changes with the temperature in each regression parameter of the same species. Once determined εgs and temperature, SLD theory can be used to calculate the isothermal adsorption curve at a known temperature with another known temperature. The predicted isothermal adsorption curve of the shale is less in error than the isothermal adsorption curve obtained experimentally.