鄂尔多斯盆地页岩含气量测定及方法探讨

Discussion on measurement method of shale- gas content in Ordos Basin

页岩含气量是页岩含气性评价和有利区域优选的关键性参数，对页岩气资源评价和储量预测具有重要的意义。通过两种实验方法分别测定鄂尔多斯盆地中东部上古生界二叠系山西组页岩含气量，并对两种方法的准确性做了对比和讨论。解析法测定页岩含气量测量直接，数据直观，对取样要求高，测出的页岩含气量更接近真实值。等温吸附实验法取样快速简便，但受实验条件所限，需通过数学模型拟合计算含气量数值，误差较大，适合用于不同岩性和层位的页岩吸附气量的相对比较。通过实验，初步确定鄂尔多斯盆地上古生界山西组页岩含气量为0.82~1.25 m3/ t 岩石之间，0.82 m3/ t 岩石较接近真实值。

The shale - gas content is a key parameter of shale - gas bearing evaluation and favorable area preferential selection,and also plays an important role in gas resource evaluation and reserves forecast. The shale - gas content of Shanxi Formation of upper Paleozoic in mid - east of Ordos Basin was respectively measured by the analytic method and the isothermal adsorption method. The analytic method has direct measurement,visual data,high requirement for sampling,and the measured value very close to real value. The isothermal adsorption method has sampling fast and easily,and bigger error of shale - gas content value. The error was caused by mathematical model fitting due to limited experimental conditions. So the isothermal adsorption method is suitable to compare relatively the adsorption capacities of shale in different lithologies and layers. Experimental results showed that the shale - gas content was between 0. 82 m3 and 1. 25 m3 per ton of rock in Shanxi Formation of upper Paleozoic in Ordos Basin,in which 0. 82 m3 per ton of rock is very close to the actual value.