Pore Structure of Shales from High Pressure Mercury Injection and Nitrogen Adsorption Method
Pore Structure of Shales from High Pressure Mercury Injection and Nitrogen Adsorption Method
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作者：
Liu Huiqing
页岩孔隙结构在油气含量评价、天然气勘探开发中具有重要作用，但国内对页岩孔隙结构的研究较少。通过高压压汞和氮气吸附实验对页岩孔隙结构进行研究，得到了页岩孔隙结构参数，分析了孔隙结构对气体吸附和运移的影响。 结果表明，页岩中的主要孔隙为微孔和过渡孔，提供了绝大多数孔容。有机质中的微孔是比表面积的主要贡献者，是主要的吸附空间。孔隙类型复杂，孔隙形态多样。页岩中存在闭口气孔、气孔、墨瓶孔等，孔隙连通性较好。 页岩中微孔和过渡孔含量较高，有利于气体吸附，但介孔和大孔含量较低，不利于页岩气渗流和开采。
The pore structure of shales plays an important role in the evaluation of hydrocarbon content,gas exploration and development.However,there is little study on the pore structure of shales at home.Highpressure mercury injection and nitrogen adsorption experiments are employed to study the pore structure of shales and the pore structure parameters are also obtained.The effect of pore structure on gas adsorption and movement is analyzed.The results show that micropores and transitional pores are the main pore in shales,which provide the vast majority of pore volume.Micropore in the organic matter is the primary contributor to specific surface area and functions as the main adsorption space.The pore types are complicated and the pore morphology is diverse.There are airtight pores with a close end,air pores,and ink-bottle pores in shales and the pore connectivity is poor.The high content of micropore and transitional pore is beneficial for gas adsorption in shales,but the mesopore and macropore are backward,which goes against for shale gas seepage and production.