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页岩含气量的确定是页岩气储层评价和资源量评估的一项基础内容为含气量的确定。在调研国内外文献的基础上,对直接解吸法测定页岩含气量的实验原理和方法及易产生误差的损失气量的确定方法进行讨论分析,结果认为损失时间的长短、损失段的解吸速率以及算法模型的选择对损失气量估算结果有重大影响,要准确确定损失气量需利用更高分辨率解吸测试仪器,正确认识解吸速率随时间,温压条件改变的规律,提出在USBM法的理论基础上利用实验数据分阶段(密闭取心+地面逸散)逐步拟合回归,求取损失气量。
Determination of shale gas content is one of the basic contents of shale gas reservoir evaluation and resource assessment for the determination of gas content. Based on the investigation of domestic and foreign literatures, the experimental principle and method of measuring the gas content of shale by direct desorption method and the method of determining the amount of lost gas liable to produce errors are discussed and discussed. The results show that the length of lost time, desorption rate of lost section, The choice of algorithm model has a significant impact on the estimation of the loss of gas volume. To accurately determine the amount of lost gas, a higher resolution desorption testing instrument is needed to correctly understand the law of the desorption rate changing with time and temperature and pressure conditions. Based on the theory of the USBM method, Using experimental data, the regression was fitted in stages by closed-loop coring + ground dissipation to obtain the loss of gas volume.