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利用已知埋深储层在一定温度下甲烷吸附特征,预测深部或浅部储层不同温度和不同压力条件下的吸附能力,对页岩气藏的勘探开发具有重大实用意义。基于Polanyi吸附势理论与Langmuir吸附理论,揭示了温度对吸附曲线的影响规律,提出了“仅利用一条等温吸附曲线预测其他温度吸附曲线”的方法。利用本研究方法,在龙马溪组页岩S1室内实验30℃吸附数据的基础上,预测出45~120℃吸附曲线,同时,结合实际储层压力梯度与地温梯度,量化了储层埋深与页岩吸附能力关系曲线。验证结果表明:页岩S1在不同温度下的吸附曲线预测结果与实验数据基本吻合;且预测的等温吸附曲线符合Clausius-Clapeyron等量吸附热理论,从而可以仅利用一条等温吸附曲线计算出该页岩样品吸附热,将为高效评估储层条件下页岩吸附气含量奠定理论基础。
It is of great practical significance to utilize the methane adsorption characteristics of a known reservoir at a certain temperature to predict the adsorption capacity under different temperatures and pressure conditions in the deep or shallow reservoirs, which is of great practical significance for the exploration and development of shale gas reservoirs. Based on the Polanyi adsorption potential theory and the Langmuir adsorption theory, the influence of temperature on the adsorption curve was revealed, and a method of “using only one isothermal adsorption curve to predict the adsorption curve of the other temperature” was proposed. Based on the experimental data of 30 ℃ adsorption in S1 laboratory of Longmaxi Formation shale, the adsorption curve of 45-120 ℃ is predicted by this research method. Combined with the actual reservoir pressure gradient and geothermal gradient, the relationship between reservoir depth and Shale adsorption capacity curve. The results show that the prediction results of adsorption curves of shale S1 at different temperatures are in good agreement with the experimental data, and the predicted isothermal adsorption curves accord with the Clausius-Clapeyron isothermal adsorption theory, so that only one isothermal adsorption curve can be used to calculate the adsorption curve The heat of rock sample adsorption will lay a theoretical foundation for the efficient assessment of adsorbed gas content of shale under reservoir conditions.