气相色谱-热导检测器测定页岩气组分的研究

建立了气相色谱-热导检测器法测定页岩气中氮气、甲烷、一氧化碳、二氧化碳、乙烷、丙烷、异丁烷和正丁烷等组分的方法,检测数据利用仪器工作站采集和输出,采用保留时间定性,校正归一(扣除空气)法定量计算。方法的相对标准偏差(n=6)为0. 03%～4. 88%,检出限为0. 03%～0. 06%,相对误差≤4%,方法具有较好的准确度和精密度,且快速、简便,可用于大批量页岩气样品组分的分析。

Determination of Shale Gas Composition by Gas Chromatography

The components of nitrogen, methane, carbon monoxide, carbon dioxide, ethane, propane, isobutane and n butane in shale gas were determined by gas chromatography coupled with thermal conductivity detector. The test data were collected and output by the instrument workstation. Retention time was used for qualitative analysis and correction normalization method was adopted for quantitative analysis (by subtracting air). The relative standard deviations (n=6) of the measured value were between 0.03% and 4.88%, and the volume percentage of the detection limit were between 0.03% and 0.06%. The results show that the relative error of the measured value were less than 4%, which indicates that the method has good accuracy and precision. Also, the method is rapid and simple, and can be used for the analysis of composition of bulk shale gas sample.