Adsorption Characteristics and Pore Structure of Organic-Rich Shale With Different Moisture Contents

A moisture equilibration test has been designed to study the pore structure and adsorption capacity of organic-rich shale with different contents. Five humidity environments were artificially controlled obtain samples With N 2 adsorption/desorption, differences in contents compared analysed. The results showed that diameter 2–10 nm pores decreased increasing characteristics conformed GAB model. It is proposed when enters a sample, monolayer will first occur because preferentially adsorbed on surface strong hydrophilicity, filling relatively small pores. Mesopores micropores play major role water adsorption. humidity, capillary condensation gradually occurs Based methane isothermal contents, quantitative linear relationship between content established. determined underwater conditions less than dry samples, rate decline under balance varies greatly. distribution clay minerals are main controlling factor hydrophilicity shale, which certain guiding significance for further accurate evaluation gas reserves.