鄂尔多斯盆地陆相页岩吸附规律研究

发布时间：2019-01-11 10:14

【摘要】：为了研究鄂尔多斯盆地延长组陆相页岩的吸附能力,选取粒度为0.28~0.18mm(60~80目)的页岩样品,运用吸附等温测试实验研究了温度、压力、有机碳含量、含水饱和度对页岩吸附规律的影响,对比研究了不同气体在页岩上的吸附能力;运用Langmuir吸附模型拟合实验结果,探索了不同影响因素与拟合参数之间的相互关系。研究表明:吸附量随压力、有机碳含量的增加逐渐升高;随温度的升高而降低;在含水的情况下,气体的吸附量减小;不同气体的吸附能力大小依次为:CO2CH4N2。Langmuir吸附模型可以很好地描述测试压力范围内气体的吸附规律,根据拟合参数与温度、有机碳含量之间的线性关系,对Langmuir吸附模型进行了修正,预测出了不同深度、不同有机碳含量下的页岩气吸附量,验证了页岩气在高压下的"负吸附"现象。
[Abstract]:In order to study the adsorption capacity of terrestrial shale in Yanchang formation, Ordos Basin, the shale samples with the particle size of 0.28~0.18mm (600.80 mesh) were selected and the temperature, pressure and organic carbon content were studied by isothermal adsorption test. The influence of water saturation on the adsorption law of shale was studied, and the adsorption capacity of different gases on shale was compared. The relationship between different influencing factors and fitting parameters was explored by using Langmuir adsorption model to fit the experimental results. The results show that the adsorption capacity increases gradually with the increase of pressure, decreases with the increase of temperature, decreases with the increase of water content, and decreases with the increase of temperature. The adsorption capacity of different gases is as follows: CO2CH4N2.Langmuir adsorption model can well describe the adsorption law of gases in the range of test pressure, according to the linear relationship between parameters and temperature, organic carbon content. The Langmuir adsorption model was modified to predict the adsorption capacity of shale gas at different depths and different organic carbon contents. The phenomenon of "negative adsorption" of shale gas under high pressure was verified.
【作者单位】：西南石油大学油气藏地质及开发工程国家重点实验室;中海石油(中国)有限公司湛江分公司;
【基金】：国家自然科学基金项目“基于密度泛函理论研究页岩气藏气固吸附微观机理”(51204141)
【分类号】：P618.13

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