泥页岩吸附气量随地层埋深变化趋势预测分析  

Reasonable Utilization of Isothermal Adsorption Experiment Data to Predict the Shale Adsorbed Gas Content Changing with Burial Depth

作　　者：邢金艳 姜振学[1,2] 陈磊[1,2] 郝进[1,2] 

机构地区：[1]中国石油大学(北京)油气资源与探测国家重点实验室,北京102249 [2]中国石油大学(北京)非常规天然气研究院,北京102249 [3]中国华电集团科学技术研究总院,北京100160

出　　处：《现代地质》2014年第5期1041-1045,共5页Geoscience

基　　金：国家科技重大专项"大型油气田及煤层气开发"(2011ZX05003-001)

摘　　要：泥页岩在地层温度和压力条件下的吸附气量对于资源评价、有利区优选具有重要意义。因此,有必要确定在温度和压力双变量因素影响下页岩的吸附气量及其变化规律。通过合理运用不同温度下的等温吸附实验数据,将温度和压力双变量因素转化为埋深这个单一因素。选取某A样品,进行不同温度下的等温吸附实验,合理利用不同温度点和实验测试压力点的吸附气量数据,并通过温度梯度、压力系数实现温度、压力、埋深之间的相互转换,预测出其它温度点对应的吸附气量,从而建立该样品吸附气量随着埋深变化的定量预测模型。通过该模型计算未测试温度点的吸附量,结果准确可靠,认为该方法可以作为一种计算页岩吸附气含量的新方法。研究表明吸附气量随着深度的变化存在一个深度转折点,在该深度以浅的范围,吸附气量随着深度的增大而增大,压力起决定作用;在该深度以深的范围,吸附气量随着深度的增大而减小,温度起决定作用。Adsorbed gas content under the condition of the reservoir temperature and pressure is of great signifi- cance for shale gas resource evaluation and target area selection. Therefore, it is necessary to obtain the shale adsorbed gas content and its transformation law under the double variable factors of the reservoir temperature and pressure. By reasonable utilization of isothermal adsorption experiment data under different temperatures, the temperature and pressure double variable factors turn into the single factor of burial depth. We choose one sam- ple A do the isothermal adsorption experiment under different temperatures, rational utilization of different tem- perature points and experimental pressure, to finish the conversion between temperature, pressure and buried depth through the parameters of temperature gradient, pressure coefficient. Further predicting the corresponding adsorbed gas content of other temperature points, so as to build the adsorbed quantitative prediction model with the burial depth. We use the model to calculate the adsorbed gas content of untested temperature, and the result is relatively accurate. The model is seen as a new reliable method to calculate adsorbed gas content. The re- search shows that the adsorbed gas content increases first and then decreases with the burial depth increases, and there exists a depth turning point. Above the depth turning point, pressure has more important effect on ad- sorbed gas content than temperature, and below the depth turning point, temperature has more important influ ence than pressure.The method makes the best of the experimental data,reflecting the adsorbed gas content transformation law directly,and it has an important guiding significance for resource evaluation.

关 键 词：等温吸附 吸附气量 温度 压力 埋深 预测模型 

分 类 号：TE132.2[石油与天然气工程—油气勘探]