Shale reservoir storage of hydrogen: Adsorption and diffusion on shale

In this study, a series of hydrogen adsorption and diffusion tests were conducted on shale samples at high pressure and elevated temperatures to assess the potential hydrogen geo-storage in shale reservoir. Experimental results show that hydrogen can be adsorbed on shale surfaces which accounts for approximate 65% to 80 % amount of methane adsorption for the tested samples. The hydrogen adsorption capacity correlated positively with pressure and negatively with temperature. The Freundlich model can be used to predict the hydrogen adsorption behavior of the tested shale samples. Hydrogen diffusion coefficients are much larger than the equivalent methane diffusion coefficients, and both of them show an increasing trend versus temperature and a decreasing trend versus pressure. The results of this study illustrate that hydrogen can be stored as an adsorbed phase on kerogen and clay minerals, which could provide fundamental data for hydrogen storage on shale reservoirs.

Automated summary

This study conducted hydrogen adsorption and diffusion tests on shale samples at high pressure and elevated temperatures to assess its potential geo-storage capacity. The experimental results indicate that hydrogen can be adsorbed on shale surfaces and the adsorption capacity is positively correlated with pressure and negatively correlated with temperature. The diffusion coefficients of hydrogen are much larger than those of methane and both exhibit an increasing trend with temperature and a decreasing trend with pressure. This study provides fundamental data for hydrogen storage on shale reservoirs.