Factors Influencing Potential CO2 Storage Capacity in Shales

This article aims at presenting research on the sorption of carbon dioxide on shales, which will allow to estimate the possibility of CO2 injection into gas shales. It has been established that the adsorption of carbon dioxide for a given sample of sorbent is always greater than that of methane. Moreover, carbon dioxide is the preferred gas if adsorption takes place in the presence of both gases. In this study CO2 sorption experiments were performed on high pressure setup and experimental data were fitted into the Ambrose four components models in order to calculate the total gas capacity of shales as potential CO2 reservoirs. Other data necessary for the calculation have been identified: Total organic content, porosity, temperature and moisture content. It was noticed that clay minerals also have an impact on the sorption capacity as the sample with lowest TOC has the highest total clay mineral content and its sorption capacity slightly exceeds the one with higher TOC and lower clay content. There is a positive relationship between the total content of organic matter and the stored volume, and the porosity of the material and the stored volume.