Experimental analysis of adsorption capacities and behaviors of shale samples

Merey, Şükrü
In recent years, unconventional reserves such as shale gas reservoirs have become a major alternative source of energy in the world. It is known that Turkey has shale gas potentials especially in the Southeastern and Thrace region. In shale gas reservoirs, significant amounts of natural gas exist as conventional “free” gas in porous spaces as well as “adsorbed” gas on shale matrix. Understanding adsorption capacities and behaviors of shale gas reservoirs may help exploitation and resource evaluation. In this study, experimental adsorption measurements for shale samples obtained from different shale gas reservoirs in Turkey were conducted at various pressures and temperatures by using pure methane and pure carbon dioxide. It was shown that the effects of temperature and pressure on adsorption are very important. Matlab programs for Ono-Kondo monolayer model, Ono-Kondo three layer model and Ono-Kondo model for binary mixtures of methane and carbon dioxide were written in this study. By using Langmuir model and Matlab programs for Ono-Kondo models, experimental adsorption results were evaluated and adsorption isotherms were constructed. The advantages and disadvantages of these models were compared. It was concluded that Ono-Kondo monolayer model is thoroughly capable to fit adsorption isotherms of shale samples. By using Ono-Kondo monolayer model data, absolute adsorption values were calculated for all adsorption experiments. By conducting carbon dioxide adsorption experiments on shale samples in this study, it was shown that carbon dioxide might be stored in depleted shale gas reservoirs. In this study, initial shale gas-in place equation that uses Langmuir model were modified for Ono-Kondo monolayer model, and then initial-gas in place calculations for unit weight of shale deposits were done. It was shown that shale gas-in place equation proposed in this study is a good alternative for most accurate shale gas-in place calculations.


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Citation Formats
Ş. Merey, “Experimental analysis of adsorption capacities and behaviors of shale samples,” M.S. - Master of Science, Middle East Technical University, 2013.