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页岩气吸附特征和吸附机理以及以其为基础的页岩气藏吸附气储量正确评价,是正确制定页岩气藏开发技术政策和开发方案的基础。美国的页岩调查显示北美页岩的含水饱和度均不为零,我国南方海相页岩的调查资料也显示其储层都是含水的。由此我们可以得出一个结论:不论国内还是国外,页岩气藏都有不同程度含水。目前,页岩吸附实验是按煤层气标准,利用烘干粉碎页岩样品进行,而页岩储层含水,实验条件与页岩气藏实际条件相差甚远,致使得到的实验结果与页岩气储层实际相差甚远,也无法正确评价实际页岩气藏吸附气含量。
The shale gas adsorption characteristics and adsorption mechanism and the correct evaluation of the adsorbed gas reserves of shale gas reservoirs based on them are the bases for the correct formulation of technical policies and development plans for shale gas reservoirs. The shale survey in the United States shows that the water saturation of North American shale is not zero. The survey data of the marine shale in southern China also show that all the reservoirs in this area are water-bearing. From this we can conclude that shale gas reservoirs contain water to varying degrees, both at home and abroad. At present, the shale adsorption experiments are conducted on the basis of coalbed methane standards by means of drying and shattering of shale samples. However, the shale reservoirs contain water and the experimental conditions are far from the actual conditions of shale gas reservoirs. As a result, The reservoirs actually fall far apart and can not correctly evaluate the sorbed gas content in the actual shale gas reservoirs.